the process of distinguishing between different types or forms
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8-methoxycarbonyoctyl 2-acetamido-4,6-O-benzylidene-2-deoxy-3-O-(3,4,6-tri-O-benzyl-2-O-phenoxythiocarbonyl-β-D-galactopyranosyl)-β-D-glucopyranoside
(E)-1-(3-azidophenyl)-3-(4-hydroxy-3-methoxyphenyl)prop-2-en-1-one