. "(butorphanol tartrate) 17-cyclobutylmethyl-(1S,9R,10S)-17-azatetracyclo[7.5.3.01,10.02,7]heptadeca-2(7),3,5-triene-4,10-diol with 2,3-dihydroxysuccinic acid" . "butorphanol tartrate" . . . . . . .