This invention relates to 5-alkynyl-pyridine of general formula (I) their use as SMAC mimetics, pharmaceutical compositions containing them, and their use as a medicaments for the treatment and/or prevention of diseases characterized by excessive or abnormal cell proliferation and associated conditions such as cancer. The groups R1 to R5 have the meanings given in the claims and in the specification.本發明係關於通式(I)之5-炔基-吡啶其作為SMAC模擬物之用途、含有其之醫藥組合物及其作為用於治療及/或預防特徵在於過度或異常細胞增殖之疾病及諸如癌症等相關病狀之醫藥的用途。基團R1至R5具有申請專利範圍及說明書中所給出之含義。