Refers to molecules that have a rigid or fixed structure, often due to the presence of a ring or other structural feature that limits their flexibility.
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Silane, (1,1-dimethylethyl)(3-ethenylphenoxy)dimethyl-
Cyclobutanecarboxylic acid, 2-[cyano(triphenylphosphoranylidene)acetyl]-, methyl ester, (1R,2S)-
(1S,3R,4S,5R,6S,7S)-ethyl 4,5-bis(benzyloxy)-3-((tert-butyldimethylsilyloxy)methyl)-2-oxabicyclo[4.1.0]heptane-7-carboxylate
2-((S)-1-Amino-5-benzyloxycarbonylamino-pentyl)-oxazole-4-carboxylic acid
