FIG 3.
Synthesis of 23SMB022, 23SMB026, 23SMB054, 26SMB070, and 27SMB009. Reagents and conditions: (a) sodium methoxide, methanol, 25°C, 1 week; (b) appropriate α,ω-diamine (or spermidine for 23SMB054), 4 M HCl in dioxane, methanol, 25°C (5 to 92%).
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