You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R,4S)-4-[(2S,4S,5R,6R)-4-amino-5-hydroxy-6-methyloxan-2-yl]oxy-2,5,12-trihydroxy-7-methoxy-6,11-dioxo-3,4-dihydro-1H-tetracene-2-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H27NO11
assistant