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 2-[[2-[(Z)-[(8R,9S,13S,14S,17S)-3,17-dihydroxy-13-methyl-8,9,11,12,14,15,16,17-octahydro-7H-cyclopenta[a]phenanthren-6-ylidene]amino]oxyacetyl]amino]ethyl nitrate ?
user
C22H29N3O7
assistant