[S-(R*,R*)]-6,7-dimethoxy-3-(5,6,7,8-tetrahydro-4-hydroxy-6-methyl-1,3-dioxolo[4,5-g]isoquinolin-5-yl)phthalide (3S)-6,7-Dimethoxy-3-[(5R)-5,6,7,8-tetrahydro-4-hydroxy-6-methyl-1,3-dioxolo[4,5-g]isoquinolin-5-yl]isobenzofuran-1(3H)-one Desmethylnarcotine (3S)-3-[(5R)-4-hydroxy-6-methyl-7,8-dihydro-5H-[1,3]dioxolo[4,5-g]isoquinolin-5-yl]-6,7-dimethoxy-3H-2-benzofuran-1-one (3S)-3-[(5R)-4-hydroxy-6-methyl-7,8-dihydro-5H-[1,3]dioxolo[4,5-g]isoquinolin-5-yl]-6,7-dimethoxy-3H-isobenzofuran-1-one narcotoline Noscapine Impurity 6(Narcotoline) 1(3H)-Isobenzofuranone, 6,7-dimethoxy-3-[(5R)-5,6,7,8-tetrahydro-4-hydroxy-6-methyl-1,3-dioxolo[4,5-g]isoquinolin-5-yl]-, (3S)-