4,8-dipiperidin-1-ylpyrimido[5,4-d]pyrimidine-2,6-disulfonyl dichloride HOMOPURINE,2,6-BIS-(CHLOROSULFONYL),4,8-DIPIPERIDINO InChI=1/C16H20Cl2N6O4S2/c17-29(25,26)15-20-12-11(13(21-15)23-7-3-1-4-8-23)19-16(30(18,27)28)22-14(12)24-9-5-2-6-10-24/h1-10H pyrimido[5,4-d]pyrimidine-2,6-disulfonyl dichloride, 4,8-di-1-piperidinyl-