different forms or versions of a particular molecule or compound.
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FMOC-ASP(OTBU)-THR(PSIME,MEPRO)-OH
O-trichloroacetimidoyl {[2,3,4-tri-O-benzyl-β-D-xylopyranosyl-(1->4)]-2,3-di-O-isopropylidene-L-rhamnopyranosyl-(1->2)}-4-azido-4-deoxy-3,6-di-O-benzyl-α-D-galactopyranoside