16597-25-4 Benzeneacetic acid, .alpha.-cyclopentyl-.alpha.-hydroxy-, 1-methyl-3-piperidinyl ester, hydrochloride Mandelic acid, .alpha.-cyclopentyl-, 1-methyl-3-piperidyl ester, hydrochloride N-Methyl-3-piperidyl phenylcyclopentylglycolate hydrochloride NSC172247