Rifamycin Impurity A

Chemical Name: [(2S,12Z,14E,16S,17S,18R,19R,20R,21S,22R,23S,24E)-21-(acetyloxy)-5,6,17,19-tetrahydroxy-23-methoxy-2,4,12,16,18,20,22-heptamethyl-1,11-dioxo-1,2-dihydro-2,7-(epoxypentadeca[1,11,13]trienazano)naphtho[2,1-b]furan-9-yl]acetic acid 

Smile: O=C1[C@](O/C=C/[C@]2([H])OC)(C)OC3=C1C4=C(C(O)=C3C)C(O)=C(NC(/C(C)=C\C=C\[C@@](C)([H])[C@@](O)([H])[C@](C)([H])[C@](O)([H])[C@](C)([H])[C@@](OC(C)=O)([H])[C@@]2(C)[H])=O)C=C4OCC(O)=O