You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [(R)-[4-[(2R)-butan-2-yl]phenyl]-thiophen-2-ylmethyl]-[(2S)-1-(methoxycarbonylamino)-1-oxopropan-2-yl]azanium by IUPAC nomenclature, provide its molecular formula.
user
C20H27N2O3S+
assistant