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(A) ESI-MS of product. 15,900 Da expected, 15,897 Da observed. (B) Re-injection of purified PS-22/9/9 TIVA on RP-HPLC. (C) Melting curve analysis of PS-22/9/9 while caged (red), photolyzed (blue), or photolyzed and RNA target-bound (green).