You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule N-methyl-2-(morpholin-4-ylmethyl)-N-[[(2R)-oxolan-2-yl]methyl]-5-thiophen-2-ylthieno[2,3-d]pyrimidin-4-amine ?
user
C21H26N4O2S2
assistant