2H-Pyran-2-butanamide,6-[(2S,3S,6E,8E)-9- [(3S,6S,9R,10R,11S,12S,13E,15E,18S,21S)-10,- 12-dihydroxy-3-[(3-hydroxyphenyl)methyl]- 11-methyl-6-(1-methylethyl)-2,5,8,20- tetraoxo-9-(3-oxobutyl)-19-oxa-1,4,7,25- tetraazabicyclo[19.3.1]pentacosa-13,15-dien- 18
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