You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (7Z)-8-methanidyl-4-methyl-12-methylidene-14-oxatricyclo[9.3.0.02,4]tetradec-7-en-13-one;yttrium .
user
C16H21O2Y-
assistant