That minty-numbing taste could be a 'thing' in common with nitrobenzodiazepines, although I've only taken nitrazepam and nifoxipam, and a couple of other, less potent but long forgotten nitro-benzos, but I've a script for moggies that, contrary to their tendency for amnesic effects in USERS, appears to have caused one in my fucking doctor, who was asked for a script with a beginning and definite end date by myself, and who then went on and doubled it then not cancelled it, telling me 'take it twice a day' and just left it, or almost left it. Added it to my repeats so I didn't have to come in and ask the dozy get.
Not that I'm going to drop him in the scheisse, since no harm came to me, but had I not known not to follow the directions it might well have. And whilst I'm on longterm (strong) opioids (three formulations of two of them, morphine and oxy, not counting OTCs, or anything grown from poppies or other plant life, or that came from something born in a beaker that made anybody's vacuum-line output a stench of vomit for the next several oil changes too, although the doc didn't, in fairness know about any but the oxy and morphine, nor about anything that might have, perhaps come from morphine either. But he DID know I was on two morphine formulations and dosage units and a fair dose, plus quite a bit of IR oxycodone
(at least enough to seemingly suddenly become capable of by virtue of my mere presence in a shared room for less than the time it takes to speak the words 'good morning doc' to, of pissing them off like a rotting, louse-riddled syphillitic lesion with a severe case of tellurium breath, in all but the case of the prescribing dr originally and one other) Anyone of the others even within a light-year of cunthood seems automatically to despise me for so much as being a patient on the meds in question.
Bloody politician-shagging pack of mingemongering twofaced spineless little polyps. Handing out with one palm what they make abundantly clear they'd like to slap me for accepting with the other, were it not for the standing orders of those two doctors and a long history of unquestioned repeats with rare changes over years, such as one trying me on fentanyl and my going back the next day and begging for the oxy I was on at the time to be reinstated instead, since I didn't like the fent one bit.
As a result, someone somewhere either forgot outright, or just thought 'lets reduce the number of appointments for refills in this set time period planned by this patient by putting it on indefinite repeat', so I've had my share of nitrazepam, and damn if it doesn't have exactly that minty-to-slightly-anaesthetizing type sensation on the oral mucosa. No yellow color to the tablets but thats saying nowt at 5mg a pill 6-8x a day as and when, rather than the daily 10mg they tell me I should (still) be taking, despite the need that instituted the rx no longer being there. Still, not going to throw away a resource which would be difficult to re-acquire when it is not even asked of me. Sooner cache them and use them when I really do need them, like to take the edge off when my pain meds run low, and I need a solid smack round the head with a big, benzo-shaped stick to get any rest for the next two days. Writing off whichever DR's amnesia/dotage got that one written down as 'repeat automatically printed to schedule every week' as an error on their part and in my favour enough for it to be a resource that'd be hard-gotten generally and that I'm sure as shit stinks going to mine out deeper than the shade of an albino's cheeks after cutting cheese in an elevator shared with elderly lady nuns who are busy taking a mutual masturbation break. With the aid of a dog, having just been caught doing so. On camera. ;P
Flunitrazolam sounds bordering on dangerous though just from the name of the stuff. A fluorinated nitro-triazolobenzodiazepine is a pretty bald-faced and blatant shot on the part of some enterprising chemist with some knowledge of SAR to come up with the results pending a train of thought going something pretty damn close to ''now what factors can be put together to make a 1,4-benzodiazepine with a long action, powerfully hypnotic general flavour and be a real fuckoff wall-banger of a tranq, fit either for drug pigs with bank cards or taking down any stray rhinoceros that might just happen to escape from the local zoo, cry havoc and let slip the dogs of war, straight through the cat-flap in the front door of my lab''
''X=fuckedup/2, solve for X'', 1,4-benzodiazepine' in their lab notebook. Or sideways up the nearest wall in reverse gear when driving on the part of the first test studies in humans. Whilst managing to drive a rabbit. Or perhaps 'at least TAKING this, as opposed to withdrawing from overuse, won't kill anyone very likely, lets let it loose and have it become the 'fent-a-benzo'. The nitrobenzodiazepines are well known for being quality goods, and popular with benzo fans, whilst the triazolo ring tends to mean potency shoots up quicker than a desperate junkie given his body-weight in skag, a bag of needles and water amps, and fluorination tends to give benzos with a long half life, doubtless the fluorination making them somewhat metabolism-resistant. 1x3=one mean ass cunt of a benzo to flog on the grey market that'll have random tranq-heads fornicating in the church pews in zero to jack shit time flat. Sounds like a fucker for tolerance too which is pretty shitty.
Although IMO I can discount the theory that, despite your friendly neighborhood nitro group making for a good chromophore, be it Ar-NO2 or aliphatic nitro, P2NP being a candidate for an amphetamine impurity to any significant level. It is indeed yellow, a very pretty yellow, especially when crystallized with an artful hand, but ever got that stuff into a scratch? lets just say, that the first person to try smoking any P2NP-contaminated amphetamine/meth/N-ethylamphetamine would be the last if anyone else got word of it from them. Ever been in a room with the stuff when it gets hot, and inhale any vapor? its pretty passable teargas. We aren't talking 'acrolein' downright toxic or chloroacetone-level of 'arrghhh my eyes, my eyes, who kicked red hot sand in my eyes and nose and throat and stepped on my face! where the FUCK are the fresh canisters for my mask????' but a room full of dispersed P2NP vapors will do one pretty well as a substitute for an improvised lachrymatory agent of respectable capacity for the task of dispersing a crowd, rather than attracting clientele wishing to snort something that comes from it, or smoke it. I'd shudder to imagine what trying to inhale the smoke of some P2NP on tinfoil would be like. NOT something I'd like to try. It LOOKS pretty, it actually manages to smell quite pleasant in sub-lachrymatory concentrations, and its made from the uber-tasty-smelling benzaldehyde (benzaldehyde has a scent like marzipan, and is actually used in small amounts, diluted in edible oil to make artificial almond essence. And it smells fucking lovely, I can't work with benzaldehyde without clocking off thinking 'fuck me, do I ever want something sweet and pastry-based to EAAAAATTTTTTTTTTTTT' and hell take anybody stupid and suicidal enough to get between me and sweet snack type junk food after getting up close and personal with some nice fresh benz

Its got to be one of the nicest smells, along with diethyl ether and chloroform ever to come out of an RBF.