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(R)-2-tert-Butoxycarbonylamino-propionic acid (6E,8E,10E,16Z)-(5R,13S,14R,15R)-22-(tert-butyl-dimethyl-silanyloxy)-15-hydroxy-5-methoxy-14,16-dimethyl-3-oxo-2-aza-bicyclo[18.3.1]tetracosa-1(24),6,8,10,16,20,22-heptaen-13-yl ester