1-Propanamine, 3-benzofuro(3,2-c)(1)benzoxepin-6(12H)-ylidene-N,N-dimethyl-, (E)-2-butenedioate (1:1) 34522-46-8 L 6257 N,N-Dimethylbenzofuro(3,2-c)(1)benzoxepin-delta(sup