ARL67156 is not an effective inhibitor of NTPDase2, NTPDase8, NPP3 and ecto-5′-nucleotidase (CD73). And It also reduces the activity of these enzymes[1]. ARL67156 trisodium salt is also an effective inhibitor of UTP breakdown by superior cervical ganglion cells and to potentiate contractions elicited by this nucleotide in isolated tail artery of rat.