1,3-Dimethyl-2,4-dioxo(1H,3H)pyrimido dimethyltetrathiafulvalene 2-(4,5-Dimethyl-1,3-dithiol-2-ylidene)-4,6-dimethyl[1,3]dithiolo[4,5-d]pyrimidine-5,7(4H,6H)-dione AIDS-141962 AIDS141962 NSC658469