1-Ethyl-5-(2-hydroxy-3-(4-benzyl-1-piperidyl)propoxy)-3,4-dihydrocarbostyril monooxalate 2(1H)-Quinolinone, 3,4-dihydro-1-ethyl-5-(2-hydroxy-3-(4-(phenylmethyl)-1-piperidinyl)propoxy)-, ethanedioate (1:1) (salt) 78467-49-9