rotamer

ro·ta·mer

(rō'ta-mĕr), An isomer differing from other conformation(s) only in rotational positioning of its parts, such as synperiplanar and synclinal forms.

ro·ta·mer

(rō'tă-mĕr) An isomer differing from other conformation(s) only in rotational positioning of its parts, such as cis- and trans- forms.