You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N'-[amino-[2-[3-(ethoxymethyl)-13-methyl-1,2,3,4,5,6,7,8,9,10,11,12,14,15,16,17-hexadecahydrocyclopenta[a]phenanthren-17-yl]propyl]amino]ethanimidamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H48N4O
assistant