You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-[(5S)-5-methyl-2-[[4-[3-methyl-4-(6-methylpyridin-3-yl)oxyanilino]quinazolin-6-yl]amino]-4H-1,3-oxazol-5-yl]ethanol by IUPAC nomenclature, provide its molecular formula.
user
C27H28N6O3
assistant