The present invention relates to compounds of formula (I) or a pharmaceutically acceptable acid addition salt thereof, a racemic mixture or a corresponding enantiomer and / or optical isomer thereof: (I) In this formula, R <； 1 >； is hydroxy or amino； R 2 is tert-butyl or isobutyl； R 3 is lower alkyl, lower alkyl substituted by hydroxy, - (CH 2 ) 2 C (O) -NH 2 , - (CH 2 ) 3 -NH 2 or -CH 2 -5 aromatic heterocyclic group； R <； 4 >； is hydrogen or lower alkyl； R <； 5 >； is hydrogen or lower alkyl； or R 4 and R 5 together with the N and C elements to which they are attached may optionally form a pyrrolidine ring, a piperidine ring or an azetidine ring optionally substituted with hydroxy or halogen； R 6 is selected from the group consisting of hydrogen, lower alkyl, lower alkyl substituted with hydroxy, - (CH 2 ) 2 C (O) OH, - (CH 2 ) 2 C (O) NH 2 optionally substituted with amino or hydroxy benzyl, -CH 2 -5 membered aromatic heterocyclic group, indolyl, -CH 2 - cycloalkyl, cycloalkyl, - (CH 2) 2 -S- lower alkyl or - (CH 2)1-4 -NH 2, and ； R <； 6 >； is hydrogen or lower alkyl； or R 6 and R 6 ' are together cycloalkyl； X is -C (O) -CHR-NR'-C (O) -； R / R 'independently from each other are hydrogen or lower alkyl； m is 2； o is 0 or 1. The compounds of the present invention are useful for the treatment of anxiety, including schizophrenia, mental illness and memory loss, alcohol withdrawal symptoms, drug addiction and Prader-Willi syndrome including stress, anxiety disorders and depression including autism, post traumatic stress disorder Oxytocin receptor agonists.본 발명은 화학식 Ⅰ의 화합물 또는 이의 약학적으로 허용가능한 산 첨가 염, 라세믹 혼합물 또는 이의 상응하는 거울상이성질체 및/또는 광학이성질체에 관한 것이다:[화학식 Ⅰ]상기 식에서, R1은 하이드록시 또는 아미노이고；R2는 2차-부틸 또는 이소부틸이고；R3은 저급 알킬, 하이드록시로 치환된 저급 알킬, -(CH2)2C(O)-NH2, -(CH2)3-NH2 또는 -CH2-5원 방향족 헤테로환 기이고；R4는 수소 또는 저급 알킬이고； R5는 수소 또는 저급 알킬이거나； 또는R4 및 R5는, 이들이 결합된 N 및 C 원소와 함께, 임의적으로 하이드록시 또는 할로겐으로 치환된 피롤리딘 고리, 피페리딘 고리 또는 아제티딘 고리를 형성할 수 있고；R6은 수소, 저급 알킬, 하이드
