Inhibitors of human immunodeficiency virus replication

An isomer, racemate, enantiomer or diasteriomer of compounds of formula (I):

• wherein:
• R4 is aryl optionally substituted with 1 to 3 substituents each independently selected from halo, (C1-6)alkyl, (C2-6)alkenyl, (C1-6)haloalkyl, (C3-7)cycloalkyl, —OH, —O(C1-6)alkyl, —SH, —S(C1-6)alkyl, —NH2, —NH(C1-6)alkyl and —N((C1-6)alkyl)2;
• wherein the (C1-6)alkyl is optionally substituted with hydroxy, cyano or oxo;
• and
• R6 and R7 are each independently selected from H, halo, (C1-6)alkyl and (C1-6)haloalkyl;
• or a salt or an ester thereof.