GSK4028 is the enantiomeric negativecontrol of GSK4027, which is a PCAF GCN5 bromodomain chemical probe. The pIC50 of GSK4028 is 4.9 in a TR-FRET assay.
GSK9311 hydrochloride, a less active analog of GSK6853, can be used as a negativecontrol. GSK9311 hydrochloride inhibits BRPF bromodomain (pIC50s: 6.0 and 4.3 for BRPF1 and BRPF2).