Disclosed is a compound which is 17-chloro-5,13,14,22-tetramethyl-28-oxa-2,9-dithia-5,6,12,13,22-pentaazahepta cyclo[27.7.1.14,7.011,15.016,21.020,24.030,35]octatriaconta-1(37),4(38),6,11,14,16,18,20,23,29,31,33,35-tridecaene-23-carboxylic acid (Formula I)and enantiomers and pharmaceutically acceptable salts thereof. Also disclosed are pharmaceutical compositions of 17-chloro-5,13,14,22-tetramethyl-28-oxa-2,9-dithia-5,6,12,13,22-pentaazahepta cyclo[27.7.1.14,7.011,15.016,21.020,24.030,35]octatriaconta-1(37),4(38),6,11,14,16,18,2 0,23,29,31,33,35-tridecaene-23-carboxylic acid, and enantiomers and pharmaceutically acceptable salts thereof, and methods of treating cancer with such compounds and compositions.揭露了一種化合物,該化合物係17-氯-5,13,14,22-四甲基-28-氧雜-2,9-二硫雜-5,6,12,13,22-戊氮雜庚環[27.7.1.14,7.011,15.016,21.020,24.030,35]三十八碳-1(37),4(38),6,11,14,16,18,20,23,29,31,33,35-十三烯-23-甲酸(化學式I)及其鏡像異構物和藥學上可接受的鹽。還揭露了17-氯-5,13,14,22-四甲基-28-氧雜-2,9-二硫雜-5,6,12,13,22-戊氮雜庚環[27.7.1.14,7.011,15.016,21.020,24.030,35]三十八碳-1(37),4(38),6,11,14,16,18,20,23,29,31,33,35-十三烯-23-甲酸的醫藥組成物及其鏡像異構物和藥學上可接受的鹽,以及用此類化合物和組成物治療癌症的方法。