6x4o
Human cyclophilin a bound to a series of acylcic and macrocyclic inhibitors: (2r,5s,11s,14s,18e)-2,11-dimethyl-14-(propan-2-yl)-3-oxa-9,12,15,21,29-pentaazatetracyclo[18.5.3.1~5,9~.0~23,27~]nonacosa-1(26),18,20,22,24,27-hexaene-4,10,13,16-tetrone (compound 21)
