2007 1,6 - SUBSTITUTED (3R,6R) -3- (2,3-DIHYDRO-1H-INDEN-2-YL)-2,5- PIPERAZINEDIONE DERIVATIVES AS OXYTOCIN RECEPTOR ANTAGONISTS FOR THE TREATMENT OF PRE-TERM LABOUR, DYSMENORRHEA AND ENDOMETRIOSIS. The present invention relates to compound S of Formula (I).