varixanthone varixanthone varixanthone is an antimicrobial made by the marine fungus emericella variecolor. varixanthone names preferred iupac name (2s)-3-hydroxy-1-xanthen-8-yl]-3-methylbutan-2-yl formate identifiers 3d model (jsmol) interactive image chembl chembl469656 chemspider 8271705 pubchem cid 10096170 inchi inchi=1s/c26h28o8/c1-12(2)15-10-32-24-13(3)8-17-20(21(24)22(15)29)23(30)19-16(28)7-6-14(25(19)34-17)9-18(33-11-27)26(4,5)31/h6-8,11,15,18,22,28-29,31h,1,9-10h2,2-5h3/t15-,18+,22-/m1/s1key: gokvxlnhayuygv-fxclautbsa-n smiles cc1=cc2=c(c3=c1oc(3o)c(=c)c)c(=o)c4=c(c=cc(=c4o2)c(c(c)(c)o)oc=o)o properties chemical formula c26h28o8 molar mass 468.502 g·mol−1 except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references