Chemical Name: 4-Ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonic acid (as per EP)

Smiles: O=S(C1=CC=C(OCC)C(C2=NC3=C(N(C)N=C3CCC)C(N2)=O)=C1)(O)=O