anthracene-7,12-dione, 64747-12-2; 3-methyl-4-phenyl-3.finaphth[2,3-e]indole-6,ll-dione, 66643-69-4; 8-phenylanthra[2,1d]thiophene-8,13-dione, 75488-33-4; 5-(2-benzo[b]thienyl)benz-[o]anthracene-7,12-dione, 75488-34-5; 5-methyl-6-phenyl-5.finaphtho[2,3-c]carbazole-8,13-dione, 66643-67-2; 5-(3-pyridyl)-benz[o]anthracene-7,12-dione, 75488-37-8; 5-(4-pyridyl)benz[a]anthracene-7,12-dione, 75488-38-9; 2-methoxy-3-(2-methoxy-lpropeny 1)-1,4-naphthoquinone, 93404-28-5; 2-bromo-3-(2-methoxy-1-propenyl) -1,4-naphthoquinone, 93404-29-6; 2-acetonyl-3methoxy-1,4-naphthoquinone, 91406-82-5; 2-acetonyl-3-bromo-1,4-naphthoquinone, 91406-81-4; 6-methoxy-5,8-quinoxalinedione, 56369-10-9.