pirnabine pirnabine pirnabine (sp-304) is a synthetic cannabinoid receptor ligand, which was developed for the treatment of glaucoma. pirnabineidentifiers iupac name (3,6,6,9-tetramethyl-7,8,9,10-tetrahydrobenzochromen-1-yl) acetate cas number19825-63-9 ypubchem cid50137chemspider45469uniis3fhl03f60chemical and physical dataformulac19h24o3molar mass300.398 g·mol−13d model (jsmol)interactive image smiles o=c(c)oc1cc(c)cc(oc2(c)c)c1c(c3)=c2ccc3c inchi inchi=1s/c19h24o3/c1-11-6-7-15-14(8-11)18-16(21-13(3)20)9-12(2)10-17(18)22-19(15,4)5/h9-11h,6-8h2,1-5h3key:aadnqnoxnweyhs-uhfffaoysa-n (verify)