PF-431396 hydrate has been used as a dual inhibitor of proline-rich tyrosine kinase 2 (PYK2) / focal adhesion kinase (FAK) inhibitor to study its effects on phosphorylation of Yes-associated protein (YAP) at Ser127 and steady state of transcriptional coactivator with PDZ-binding motif (TAZ)
[1]. It has also been used as a PYK2/FAK inhibitor to study its effects on protein kinase A activation in human sperm samples
[2].