2-Butoxyethyl alpha-phenyl-1-piperidineacetate 55837-15-5 Butopiprina [INN-Spanish] Butopiprine Butopiprine (LD 2351 - AS HBr) Butopiprine [DCF:INN] Butopiprinum [INN-Latin] EINECS 259-848-7 alpha-Piperidino-alpha-phenyl-essigsaeure-2-butoxyethylester