. . . . . . "9,10-Dimethoxy-3-methyl-2-[(2,4,6-trimethylphenyl)imino]-2,3,6,7-tetrahydro-4H-pyrimido[6,1-a]isoquinolin-4-one" . "Trequinsin" . . "trequinsin" . . . . . . . . "Trequinsin" . . .