New furocarbazole alkaloids from <i>Lonicera quinquelocularis</i>

<div><p>Two new furocarbazole alkaloids, 3-formyl-6,7-dimethoxy-furo[1,2]carbazole (<b>1</b>) and methyl-6,7-dimethoxy-furo[1,2]carbazole-3-carboxylate (<b>2</b>), along with two known carbazole alkaloids, 3-formyl-2-hydroxy-7-methoxycarbazole (<b>3</b>) and methyl 2,7-dimethoxycarbazole-3-carboxylate (<b>4</b>) were isolated from the ethyl acetate soluble fraction of <i>Lonicera quinquelocularis</i>. Their structures were established on the basis of spectroscopic analysis.</p></div