Oxycodone vs U-47700 Reagent

[Madrus]

What's the minimum amount of reagent(s) you need in order to identify if your substance is oxycodone or U-47700 or some other opioid?
And what reagents to use?

 

[Transform]

The froehde and mecke reagents distinguishes many opioids and the mandelin reagent goes orange with U-47700, together these three should be sufficient to have the best chance of making an ID