has role calcium channel blocker organic molecular entity thapsigargin (3S,3aR,4S,6S,6aR,7S,8S,9bS)-6-(acetyloxy)-4-(butanoyloxy)-3,3a-dihydroxy-3,6,9-trimethyl-8-{[(2Z)-2-methylbut-2-enoyl]oxy}-2-oxo-2,3,3a,4,5,6,6a,7,8,9b-decahydroazuleno[4,5-b]furan-7-yl octanoate An organic heterotricyclic compound that is a hexa-oxygenated 6,7-guaianolide isolated fron the roots of Thapsia garganica L., Apiaceae. A potent skin irritant, it is used in traditional medicine as a counter-irritant. Thapsigargin inhibits Ca(2+)-transporting ATPase mediated uptake of calcium ions into sarcoplasmic reticulum and is used in experimentation examining the impacts of increasing cytosolic calcium concentrations. C34H50O12 CAS:67526-95-8 [H][C@@]1(OC(=O)C(\C)=C/C)[C@@H](OC(=O)CCCCCCC)[C@@]2([H])C(=C1C)[C@]1([H])OC(=O)[C@@](C)(O)[C@@]1(O)[C@H](C[C@]2(C)OC(C)=O)OC(=O)CCC