kalafungin kalafungin kalafungin is a substance discovered in the 1960s and found to act as a broad-spectrum antibiotic in vitro. it was isolated from a strain of the bacterium streptomyces tanashiensis. kalafunginclinical dataother namesu-19718atc codenoneidentifiers iupac name (3ar,5r,11br)-7-hydroxy-5-methyl-3,3a,5,11b-tetrahydro-2h-benzofuroisochromene-2,6,11-trione cas number11048-15-0pubchem cid283138chemspider391931unii7hr91t5tgwkeggd04648chemblchembl1988648comptox dashboard (epa)dtxsid40864305 chemical and physical dataformulac16h12o6molar mass300.266 g·mol−13d model (jsmol)interactive image smiles c1c2=c(3(o1)cc(=o)o3)c(=o)c4cccc(c4c2=o)o inchi inchi=1s/c16h12o6/c1-6-11-13(16-9(21-6)5-10(18)22-16)14(19)7-3-2-4-8(17)12(7)15(11)20/h2-4,6,9,16-17h,5h2,1h3/t6-,9-,16+/m1/s1key:xuwpjkdmezsvtp-ltymhzprsa-n it is not known to be marketed anywhere in the world.