10-Hydroxy-8-methyl-3-(2-propynyl)-1,2,3,4-tetrahydro-5H-(1)benzopyrano(3,4-c)pyrid-5-one 27296-62-4 5H-(1)Benzopyrano(3,4-c)pyrid-5-one, 1,2,3,4-tetrahydro-10-hydroxy-8-methyl-3-(2-propynyl)- BRN 0619476