You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-ethyl-2,4,10,13-tetraoxa-3-aluminatricyclo[12.3.1.15,9]nonadeca-1(17),5,7,9(19),14(18),15-hexaene The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H17AlO4
assistant