L-Proline,L-methionyl-L-prolyl-L-leucyl-L-isoleucyl-L-prolyl-L-arginyl-L-alanyl-L-seryl-L-a-aspartyl-L-a-glutamyl-L-asparaginyl-L-valyl-L-prolyl-
CAS No. 583884-17-7
Robitussin-DM 72101-06-5