guanacastepene a guanacastepene a guanacastepene a is a compound showing antibiotic activity. it is a diterpene that was extracted with hexane from a costa rican fungus, cr115, found on the branches of the daphnopsis americana tree and purified by chromatography. guanacastepene a names preferred iupac name (1r,2r,6s,8ar,10ar)-5-formyl-6-hydroxy-8a,10a-dimethyl-3-oxo-1-(propan-2-yl)-1,2,3,6,7,8,8a,9,10,10a-decahydrobenzoazulen-2-yl acetate identifiers cas number 263357-41-1 y 3d model (jsmol) interactive image chemspider 8560244 y pubchem cid 10384802 unii g5h7zb2hdf y comptox dashboard (epa) dtxsid10439100 inchi inchi=1s/c22h30o5/c1-12(2)18-20(27-13(3)24)19(26)16-10-15-14(11-23)17(25)6-7-21(15,4)8-9-22(16,18)5/h10-12,17-18,20,25h,6-9h2,1-5h3/t17-,18-,20+,21-,22-/m0/s1 ykey: kcpnsipchjtghj-myhsiesusa-n yinchi=1/c22h30o5/c1-12(2)18-20(27-13(3)24)19(26)16-10-15-14(11-23)17(25)6-7-21(15,4)8-9-22(16,18)5/h10-12,17-18,20,25h,6-9h2,1-5h3/t17-,18-,20+,21-,22-/m0/s1key: kcpnsipchjtghj-myhsiesubp smiles o=c\c3=c2/c=c1/c(=o)(oc(=o)c)(1(cc2(cc3o)c)c)c(c)c properties chemical formula c22h30o5 molar mass 374.477 g·mol−1 except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). y verify (what is yn ?) infobox references