(2S)-2-[(4S)-2,2-di(phenyl)-1,3-dioxolan-4-yl]piperidine PDSP1_000674 Dexoxadrol PDSP2_000664 Dexoxadrolum [INN-Latin] d-(+)-2,2-Diphenyl-4-(2'-piperidyl)-1,3-dioxolane