4,7-dimethoxy-1-vinyl-9H-beta-carboline 9H-pyrido[3,4-b]indole, 1-ethenyl-4,7-dimethoxy- InChI=1/C15H14N2O2/c1-4-11-15-14(13(19-3)8-16-11)10-6-5-9(18-2)7-12(10)17-15/h4-8,17H,1H2,2-3H