1, 3, 6, 8-Tetramethy1-2, 4, 5, 7 (1H, 3H, 6H, 8H) pyrimido [5, 4-<I>g</I>] pteridinetetrone and 1, 3, 5, 7-Tetramethy1-2, 4, 6, 8 (1H, 3H, 5H, 7H)-pyrimido [4, 5-<I>g</I>] pteridinetetrone
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