The invention provides novel compounds having the general formula (I), wherein R1, R2, R3 and A are as described herein, compositions including the compounds and methods of using the compounds. These compounds are useful as inhibitors of hormone sensitive lipase (HSL) and may be used in the treatment of diabetes, metabolic syndrome, dyslipidemia, atherosclerosis, obesity, cardiovascular diseases, myocardial dysfunction, inflammation, non-alcoholic fatty liver disease and non-alcoholic steatohepatitis.본 발명은, 하기 화학식 I의 신규 화합물, 상기 화합물을 포함한 조성물 및 상기 화합물의 사용 방법을 제공한다: [화학식 I]상기 식에서,R1, R2, R3 및 A는 본원에 기재된 바와 같다.