Levorotary

As a consequence, circular dichroism is exhibited by most biological molecules, because of the dextrorotary (e.g. some sugars ) and levorotary (e.g. some amino acids ) molecules they contain.

The rotation of the plane of polarization may be either clockwise, to the right ( dextrorotary — d-rotary), or left ( levorotary — l-rotary) depending on which stereoisomer is present (or dominant).