The central part of a structure, in this case referring to the central pyridine ring in the fused heterocycles.
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2-Formyl-3-thiophenecarboxaldehyde ethylene acetal
N-(9H-fluorene-9-ylmethoxycarbonyl)-N-[6-(2'-nitrobenzenesulfonylamino)hexyl]aminoacetic acid
C27H34O6Si
(2-bromo-6-fluoro-phenyl)-carbamic acid tert-butyl ester
(3-Azido-propyl)-(4-{[2-(5-{(S)-2-[2-(4-benzyloxy-1H-indol-3-yl)-acetylamino]-3-carbamoyl-propionylamino}-pentylcarbamoyl)-ethyl]-tert-butoxycarbonyl-amino}-butyl)-carbamic acid tert-butyl ester
