You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 1-[(1R,3R,4aS,9aR)-1-(hydroxymethyl)-3-[2-(4-methylpiperazin-1-yl)-2-oxoethyl]-3,4,4a,9a-tetrahydro-1H-pyrano[3,4-b][1]benzofuran-6-yl]-3-(4-methoxyphenyl)urea .
user
C27H34N4O6
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