You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
19-hydroxy-13-(2-methylphenyl)-2-oxapentacyclo[12.8.0.03,12.04,9.017,22]docosa-1(14),3,5,8,10,15,17(22),18,20-nonaen-7-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H20O3
assistant