Refers to a molecule or compound that is not easily deformed or bent.
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4-[(1R,2S,5R)-menthyloxy]-3,5-diphenyl-1,2,3,5,6,7-hexahydro-3a,4a-diaza-4-phosphacyclopenta[def]phenanthrene 4-sulfide
C32H25IO2
1,10-Phenanthroline, 4,7-bis[(4-ethynylphenyl)ethynyl]-3,8-dihexyl-
