(1-Ethyl-2-pyrrolidinyl)methyl alpha-cyclopentyl-alpha-hydroxybenzeneacetate hydrochloride 2001-91-4 Benzeneacetic acid, alpha-cyclopentyl-alpha-hydroxy-, (1-ethyl-2-pyrrolidinyl)methyl ester, hydrochloride MANDELIC ACID, alpha-CYCLOPENTYL-, (1-ETHYL-2-PYRROLIDINYL)METHYL ESTER, HYDROCH