You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(6S,9aS)-8-(1,3-benzothiazol-6-ylmethyl)-N-benzyl-6-[(4-hydroxyphenyl)methyl]-2-methyl-4,7-dioxo-3,6,9,9a-tetrahydropyrazino[2,1-c][1,2,4]triazine-1-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C30H30N6O4S
assistant