(S)-N-[(4-{(S)-1-[2-(4-Methoxybenzamido)-2-methylpropanoyl]pyrrolidine-2-carboxamido}-3,4,5,6-tetrahydro-2H-pyran-4-yl)carbonyl]proline dimethyl sulfoxide monosolvate (4-MeBz-Aib-Pro-Thp-Pro-OH)