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A) Synthetic scheme for preparation of BC‐cSal (22 a) and BC‐cSal*Na (22 b). Reagents and conditions: a) NaBH4, CH2Cl2, EtOH, AcOH, 0 °C, 3 h, 73 %; b) CBr4, PPh3, CH2Cl2, 0 °C→RT, 6 h, 96 %; c) ethyl salicylate, K2CO3, acetone, RT, 2 d, 92 %; d) KOH (0.2 m), MeOH, 60 °C, 4 h, 92 %; e) NaOH (0.2 m), MeOH, RT, 5 min, quant. B) Absorption spectrum of compound 22 a.
