1910-67-4 Benzeneacetic acid, .alpha.-cyclopentyl-.alpha.-hydroxy-, 1-ethyl-3-piperidinyl ester, hydrochloride Mandelic acid, .alpha.-cyclopentyl-, 1-ethyl-3-piperidyl ester hydrochloride N-Ethyl-3-piperidyl phenylcyclopentylglycolate hydrochloride NSC232091