title: [Studies on the syntheses of sulfur containing pyrimido [5,4-d]pyrimidine derivatives. I. Syntheses of pyrimido [5,4-D]pyrimidine derivatives possessing methylsulfonyl or sulfonamide group at 2-position].
mesh_terms: D000818:Animals; D003331:Coronary Vessels / Q000187:drug effects; D004285:Dogs; D010974:Platelet Aggregation / Q000187:drug effects; D011743:Pyrimidines / Q000138:chemical synthesis* / Q000494:pharmacology; D013329:Structure-Activity Relationship; D013449:Sulfonamides / Q000138:chemical synthesis; D013450:Sulfones / Q000138:chemical synthesis; D014665:Vasodilator Agents
chemical_list: D011743:Pyrimidines; D013449:Sulfonamides; D013450:Sulfones; D014665:Vasodilator Agents