viridicatumtoxin a viridicatumtoxin a viridicatumtoxin a (also simply called viridicatumtoxin) is a fungus-derived tetracycline-like antibiotic, whose chemical structure was determined in 1976. it is found in penicillium viridicatum, penicillium aethiopicum, among other fungi. "viridicatumtoxin" redirects here. for the related substance, see viridicatumtoxin b. viridicatumtoxin a names preferred iupac name (1s,7′as,11′as,12′s)-5′,6′,7′a,8′,11′a,12′-hexahydroxy-3′-methoxy-2,6,6-trimethyl-7′,10′-dioxo-7′,7′a,10′,11′,11′a,12′-hexahydro-1′h-spirotetracen]-2-ene-9′-carboxamide identifiers cas number 39277-41-3 3d model (jsmol) interactive image chebi chebi:85616 chemspider 23354402 pubchem cid 54686377 unii s8n62plu21 comptox dashboard (epa) dtxsid20893991 inchi inchi=1s/c30h31no10/c1-11-6-5-7-27(2,3)28(11)9-12-16-18(13(32)8-15(41-4)21(16)28)22(34)20-17(12)23(35)29(39)10-14(33)19(26(31)38)24(36)30(29,40)25(20)37/h6,8,23,32-35,39-40h,5,7,9-10h2,1-4h3,(h2,31,38)/t23-,28-,29-,30+/m0/s1key: suwqglgdfghznh-wbwzxodpsa-n smiles cc1=ccc(12c3c4c(c(c5c(c4c2)(6((c5=o)(c(=o)c(=c(c6)o)c(=o)n)o)o)o)o)c(cc3oc)o)(c)c properties chemical formula c30h31no10 molar mass 565.575 g·mol−1 except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references like viridicatumtoxin b, viridicatumtoxin a inhibits growth of staphylococcus aureus, including methicillin resistant s. aureus and quinolone-resistant s. aureus, with an activity 8 to 64 times greater than that of tetracycline.