4F-PHP is a stimulant compound. It is closely related to pyrovalerone, being simply its chain-lengthened homolog. Assessment of the effects of stimulants is relevant given the large population currently taking stimulants.
5-PPDI An obscure analog of α-PBP, which is itself an analog of α-PVP. This rare compound has little history of human usage. Some trip reports suggest it is inactive. If it is active it likely has a similar effect profile to other pyrovalerone stimulants.
5F-SDB-005 is an indazole-based synthetic cannabinoid that has been sold online as a designer drug. 5F-SDB-005 is the indazole core analog of PB-22 where the 8-hydroxyquinoline has also been replaced with a naphthalene group.