Patent ID: 8372846

Claim:
A co-crystal comprising (1S,3aR,6aS)-2-[(2S)-2-[[(2S)-2-Cyclohexyl-2-(pyrazine-2-carbonylamino)acetyl]amino]-3,3-dimethylbutanoyl]-N-[(3S)-1-(cyclopropylamino)-1,2-dioxohexan-3-yl]-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]pyrrole-1-carboxamide and 4-amino salicylic acid, wherein said co-crystal has X-ray powder diffraction peaks at about 4.37, 7.57, 8.47, 9.59, 12.81, and 14.75 2-Theta.