epimer
Concise Oxford English Dictionary © 2008 Oxford University Press:
epimer /ˈɛpɪmə/
▶noun Chemistry each of two isomers with different configurations of atoms about one of several asymmetric carbon atoms present.
– derivatives
epimeric /-ˈmɛrɪk/ adjective,
epimerism /ɪˈpɪm-, ɛ-/ noun.
epimeric /-ˈmɛrɪk/ adjective,
epimerism /ɪˈpɪm-, ɛ-/ noun.
'epimer' also found in these Oxford entries:

