To provide a pharmaceutical composition comprising a prescribed amount of cyclic-GMP-AMP (cGAMP) for use in formulations (including vaccine adjuvants), drug screens, therapies and diagnostics.SOLUTION: In the pharmaceutical composition, the cGAMP includes a phosphodiester bond between the 2'-OH and the 5'-phosphate of the GMP, and another phosphodiester bond between the 3'-OH of the AMP and the 5'-phosphate of the GMP.SELECTED DRAWING: None【課題】配合物(ワクチンアジュバントを含む)、薬物スクリーニング、治療法および診断法で使用される所定量の環状GMP-AMP(cGAMP)を含む、薬学的組成物の提供。【解決手段】該cGAMPがGMPの2'-OHとAMPの5'-リン酸との間のホスホジエステル結合、および、AMPの3'-OHとGMPの5'-リン酸との間に別のホスホジエステル結合を含む、該薬学的組成物。【選択図】なし