indapyrophenidone indapyrophenidone indapyrophenidone is a synthetic drug of the cathinone class that has been sold online as a designer drug. indapyrophenidonelegal statuslegal status de: npsg (industrial and scientific use only) uk: under psychoactive substances act identifiers iupac name 1-(2,3-dihydro-1h-inden-5-yl)-2-phenyl-2-(pyrrolidin-1-yl)-ethanone cas number2055940-97-9pubchem cid129844581chemspider58858896uniim2s46bf87vchemical and physical dataformulac21h23nomolar mass305.421 g·mol−13d model (jsmol)interactive image smiles o=c(c(n1cccc1)c2ccccc2)c3ccc4cccc4c3 inchi inchi=1s/c21h23no/c23-21(19-12-11-16-9-6-10-18(16)15-19)20(22-13-4-5-14-22)17-7-2-1-3-8-17/h1-3,7-8,11-12,15,20h,4-6,9-10,13-14h2key:jfdzztsfbtyydf-uhfffaoysa-n the substance is the indanyl-α-phenyl analogue of the stimulant drug α-pvp, however it is also structurally related to diarylethylamines such as fluorolintane and uwa-001. its mechanism of action is unknown.