You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
13-chloro-10-(2-cyclobutyl-3-methoxyphenyl)-10-hydroxytricyclo[9.4.0.02,7]pentadeca-1(11),2,4,6,12,14-hexaen-8-one;ethane is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H29ClO3
assistant