One-pot synthesis of (1 RS ,21 SR )-diethyl 2-[23-amino-22-ethoxycarbonyl-8,11,14-trioxa-25-azatetracyclo[19.3.1.0 2,7 .0 15,20 ]pentacosa-2,4,6,15(20),16,18,22-heptaen-25-yl]but-2-endioate

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