2H-1-Benzopyran-2-carboxamide, N-[6-amino-1-[3-(aminocarbonyl)phenyl]-1,2,3,4-tetrahydro-3-methyl-2, 4-dioxo-5-pyrimidinyl]-3,4-dihydro-6-hydroxy-2,5,7,8-tetramethyl-