Fig. 8. Potency of compound 23 at human ecto-nucleotidases: nucleoside triphosphate diphosphohydrolases1–3 (NTPDases1–3), nucleotide pyrophosphastases/phosphodiesterases 1 and 2 (NPP1; NPP2), tissue-nonspecific alkaline phosphatase (TNAP) and ecto-5′-nucleotidase (eN, CD73). pK_i values are given as means ± SEM.