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. 2020 Apr 26;25(6):959–964. doi: 10.1016/j.drudis.2020.03.008

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(a) 15 K: highly cell-permeable ester of ketorolac. (b) Vitamin D3 and its [cytochrome P450 (CYP)24-resistant] derivative MART-10. Hydroxylation of D3 at position 24 (highlighted in red) by human CYP24 inactivates D3.