1,7,8,9-Tetrahydro-5-methoxy-9-oxopyrano(2,3-g)indole-2-carboxylic acid 81258-05-1 Acide, 5-methoxy-9-oxo-7,8-dihydro-pyranno(2,3-g)indole-2-carboxylique [French] Pyrano(2,3-g)indole-2-carboxylic acid, 1,7,8,9-tetrahydro-5-methoxy-9-oxo-