1-(1-(3-(2-Oxo-6-phenylpiperidino)propyl)-4-piperidinyl)-2-benzimidazolinone oxalate 109758-38-5 2-Benzimidazolinone, 1-(1-(3-(2-oxo-6-phenylpiperidino)propyl)-4-piperidinyl)-, ethandioate, hemihydrate M.G. 16226