1,4-DPCA
1,4-DPCA, a potent prolyl-4-hydroxylase inhibitor, is a collagen hydroxylation inhibitor in human foreskin fibroblasts with an IC50 of 2.4 uM. 1,4-DPCA inhibits prolyl-4-hydroxylases α isoforms stabilizes HIF-1α protein. 1,4-DPCA also inhibits factor inhibiting HIF (FIH) with an IC50 of 60 μM.