A clear trend in the data is reflected in the fact that thermal motion in low-temperature X-ray diffraction experiments tends to lead to an apparent bond shortening.
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Crystal structure determination as part of an undergraduate laboratory experiment: 1',3',3'-tri-methyl-spiro-[chromene-2,2'-indoline] and 1',3',3'-trimethyl-4-[(<i>E</i>)-(1,3,3-tri-methyl-indolin-2-yl-idene)meth-yl]spiro-[chroman-2,2'-indoline].
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