111509-15-0 14-Ketoalstonidine 2H-Pyran-5-carboxylic acid, 3,4-dihydro-3-(hydroxymethyl)-2-methyl-4-((9-methyl-9H-pyrido(3,4-b)indol-1-yl)carbonyl)-, methyl ester, (2S-(2alpha,3beta,4beta))-