You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-(4-benzylpiperazin-1-yl)-12-phenylmethoxy-2,8,13-triazatricyclo[7.4.0.02,6]trideca-1(9),3,5,7,10,12-hexaene is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H27N5O
assistant