The present invention provides 5-(5-(2-(3-aminopropoxy)-6-methoxyphenyl)-1H-pyrazol-3-ylamino)pyrazine-2-carbonitrile and pharmaceutically acceptable salts and solvates thereof, that is capable of inhibiting CHK1 and is useful in the treatment of neuroblastomas and/or soft tissue sarcomas.本發明提供5-(5-(2-(3-胺基丙氧基)-6-甲氧基苯基)-1H-吡唑-3-基胺基)吡嗪-2-甲腈及其醫藥學上可接受之鹽及溶劑合物,其能夠抑制CHK1且適用於治療神經母細胞瘤及/或軟組織肉瘤。