You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1,8-dioxacyclotetradec-11-yne-2,7-dione;methane;(11Z)-11-tributylstannyl-1,8-dioxacyclotetradec-11-ene-2,7-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C38H68O8Sn
assistant