You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3R,4aR,8S,11R,12S,12aS)-3-ethyl-3,6,8,11,12-pentamethyl-6,7,8,9,10,11,12,12a-octahydro-4aH-[1,2,4]trioxino[5,6-b]oxecine;ethane The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H38O4
assistant