# Chemistry - What is the IUPAC preferred name of this tetracyclic natural product?

The pubchem website has given Platensimycin IUPAC name, $$3$$-$$[3$$-$$[(1S,5S,6R,7S,9S,10S)$$-$$5,9$$-dimethyl-$$4$$-oxo-$$8$$-oxatetracyclo$$[7.2.1.1^{7,10}.0^{1,6}]$$tridec-$$2$$-en-$$5$$-yl]propanoylamino]-$$2,4$$-dihydroxybenzoic acid (see attached picture):

Accordingly, since https://pubchem.ncbi.nlm.nih.gov is usually updating data according to the changes, I believe the name of the cyclic system (without 5,9-dimethyl groups) OP is asking is same as one in the comment by @KarstenTheis (including the correct stereochemistry): $$(1S,5S,6R,7S,9S,10S)$$-$$4$$-oxo-$$8$$-oxatetracyclo$$[7.2.1.1^{7,10}.0^{1,6}]$$tridec-$$2$$-ene (see the blue numbering in the picture).

Late correction: After exchanging few comments with Loong, I realized that the given system should be treated as a chemical compound. Accordingly, the name should have been: $$(1S,5S,6R,7S,9S,10S)$$-$$4$$-oxo-$$8$$-oxatetracyclo$$[7.2.1.1^{7,10}.0^{1,6}]$$tridec-$$2$$-en-$$4$$-one (as suggested by Loong).