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What is the molecular formula of the compound with this IUPAC name ethyl (9R,10S,11R)-9-(7-chloro-1-hydroxy-5,8-dimethoxynaphthalen-2-yl)-3-methoxy-11-methyl-8-oxo-14-oxa-15-azatetracyclo[7.6.1.02,7.013,16]hexadeca-1(15),2(7),3,5,13(16)-pentaene-10-carboxylate ?
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C31H28ClNO8
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