Dimethyl Sulfoxide → 2,4-dichloro-5,6a-dimethyl-6a,7,9,10-tetrahydro-[1,4]oxazino[3,4-h]pteridin-6(5H)-one

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[CH3:21][C:22]([O-:23])([CH3:24])[CH3:25].[CH3:26][S:27]([CH3:28])=[O:29].[Cl:1][c:2]1[n:3][c:4]2[c:9]([c:10]([Cl:12])[n:11]1)[N:8]([CH3:13])[C:7](=[O:14])[CH:6]1[N:5]2[CH2:18][CH2:17][O:16][CH2:15]1.[I:19][CH3:20].[OH2:30]>>[Cl:1][c:2]1[n:3][c:4]2[c:9]([c:10]([Cl:12])[n:11]1)[N:8]([CH3:13])[C:7](=[O:14])[C:6]1([CH3:21])[N:5]2[CH2:18][CH2:17][O:16][CH2:15]1