24465-45-0 4-PHENYLISONIPECOTIC ACID ETHYL ESTER 77-17-8 DEA No. 9233 EINECS 201-008-9 Ethyl 4-phenylpiperidine-4-carboxylate Ethyl-4-phenylpiperidine-4-carboxylate Nordolsin Normeperidine Norpethidine Pethidine - Intermediate-B