You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3,6,8-trimethyl-7-oxa-3lambda4-thia-2,4-diazabicyclo[3.3.0]octa-1(8),2,5-triene is the IUPAC name of a molecule. Please give its molecular formula.
user
C7H10N2OS
assistant