You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
lithium;(4aS,5S)-5-ethenyl-7-methoxy-3,4,4a,6-tetrahydro-2H-cyclopenta[b]pyran-5-olate is the IUPAC name of a molecule. Please give its molecular formula.
user
C11H15LiO3
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