You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[[(4-methoxyphenyl)-diphenylmethyl]amino]-7-[(2S,3S,4R,5R)-3-methyl-3,4-bis(phenylmethoxy)-5-(phenylmethoxymethyl)oxolan-2-yl]pyrrolo[2,1-f][1,2,4]triazine-5-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C54H50N4O7
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