A backgrounder to put these structures in perspective:
Bromazepam has a Nordazepam-like structure, with a bromine in the 7-position and the carbon of the 2-position replaced with a nitrogen to form a pyridine ring. This nitrogen makes the molecule less lipophilic, thus shorter in duration and less potent.
Flubromazepam is a Bromazepam molecule where the 2 position is a carbon, with a fluorine attached (in the manner of flunitrazepam). This group is more lipophilic and heavy, resulting in a longer duration of action and higher potency
Phenazepam is essentially Flubromazepam with the fluorine replaced by a heavier chlorine atom (in the manner of clonazepam, you could call Phenazepam "clobromazepam") leading to a higher potency still and an even longer duration of action.
Pyrazolam is essentially Bromazepam, with its pyridine nitrogen in the 2 position, but the Aniline nitrogen is fused into an added methyltriazole ring (in the manner of alprazolam) leading to shorter duration and high potency.
I apologize to the layperson for the chemical mumbo jumbo, but the bottom line is that these new RC benzo's we're seeing, Phenazepam, Flubromazepam and Pyrazolam are all close analogues to bromazepam, modified with the same alterations that gave rise to other very popular benzos.
Phenazepam = Klonopin type modification of Bromazepam
Flubromazepam = Rohypnol type modification of Bromazepam
Pyrazolam = Xanax type modification of Bromazepam