epimer

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ep·i·mer

 (ĕp′ə-mər)
n.
One of two molecules that differ in the spatial arrangement of atoms or groups surrounding only one of two or more chiral atoms in the structure.
[epi- + -mer, isomer.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

epimer

(ɪˈpɪməˌrɪzəm) chem
n
(Chemistry) either of two optical isomers differing from each other only in the configuration of the atoms about one asymmetric carbon atom
n
(Chemistry) either of two isomers differentiated by the position of the atoms around a single asymmetric carbon atom
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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In our previous study, the C24 epimeric ocotillol-type saponins were gained from 20(S)-Protopanaxadiol (20(S)-PPD), 20(S)-Protopanaxatriol (20(S)-PPT), 20(S)-Ginsenoside Rh1 (20(S)-Rh1), 20(S)-Ginsenoside Rg2 (20(S)-Rg2), 20(S)-Ginsenoside Rh2 (20(S)-Rh2) and 20(S)-Ginsenoside Rg3 (20(S)-Rg3), their cardioprotective effects were evaluated, and results showed that 24(R)-ocotillol type saponins exhibited significantly stronger myocardial protective effects than their corresponding 24(S)-epimers and ginsenosides, demonstrating distinct stereoselective activity [7-11].
Synthesis and Crystal Structures of 3,6-diacetylated C24 epimeric 20(R)-Ocotillol-Type Saponins
The two sets of [sup.1]H NMR chemical shift values for the methylene group C-26 (3.95, 3.62 and 4.06, 4.53) suggested that the saponin was actually a mixture of the 25R and 25S epimeric hemiacetals.
Aldose reductase inhibition of a saponin-rich fraction and new furostanol saponin derivatives from Balanites aegyptiaca
Additional vitamin D compounds are introduced by epimeric effects (Fig.
Mass spectrometric profiling of vitamin D metabolites beyond 25-hydroxyvitamin D
The quantitative LC-FLD data obtained from each of the snail samples enabled the calculation of relative proportions of each toxin or toxin epimeric pair in terms of contribution to total STX equivalents.
Paralytic shellfish toxins in the marine gastropods Zidona dufresnei and Adelomelon beckii from Argentina: toxicity and toxin profiles

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