1,3,4-Oxadiazol-2(3H)-one, 5-(4-ethoxy-3,5-dimethoxyphenyl)-3-(1-piperidinylmethyl)- 5-(4-Ethoxy-3,5-dimethoxyphenyl)-3-(1-piperidinylmethyl)-1,3,4-oxadiazol-2(3H)-one 73484-60-3