zardaverine zardaverine zardaverine is a dual-selective pde3/4 phosphodiesterase inhibitor. studies in vitro suggest that it may have useful anti-cancer properties. zardaverine names preferred iupac name 6-pyridazin-3(2h)-one identifiers cas number 101975-10-4 y 3d model (jsmol) interactive image chemspider 5521 pubchem cid 5723 unii tq358gwh6y y comptox dashboard (epa) dtxsid8042559 inchi inchi=1s/c12h10f2n2o3/c1-18-10-6-7(2-4-9(10)19-12(13)14)8-3-5-11(17)16-15-8/h2-6,12h,1h3,(h,16,17)key: hjmqdjpmqihlpb-uhfffaoysa-n smiles coc1=c(c=cc(=c1)c2=nnc(=o)c=c2)oc(f)f properties chemical formula c12h10f2n2o3 molar mass 268.220 g·mol−1 except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references