You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[[6-[2-(4-aminothiophen-3-yl)acetyl]pyridin-3-yl]methyl]-1-(2-morpholin-4-ylethyl)-3-(2-phenylethyl)urea into its molecular formula.
user
C27H33N5O3S
assistant