You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named actinium;[(4S,10S)-15-[(3S)-3-benzamido-3-(4-chlorophenyl)-2-hydroxypropanoyl]oxy-1,4,9,12-tetrahydroxy-10,14,17,17-tetramethyl-11-oxo-6-oxatetracyclo[11.3.1.03,10.04,7]heptadec-13-en-2-yl] benzoate by IUPAC nomenclature, provide its molecular formula.
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C43H46Ac2ClNO12
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