Ｂａｓｅ－ＣａｔａｌｙｚｅｄＲｅａｒｒａｎｇｅｍｅｎｔｏｆ１１－Ｉｓｏｐｒｏｐｙｌｉｄｅｎｅ－ａｎｔｉ－４，５－Ｅｐｏｘｙｅｎｄｏ－Ｔｒｉｃｙｃｌｏ［６．２．１．０~（２，７）］Ｕｎｄｅｃａ－４，９－Ｄｉｅｎｅ－３，６－ＤｉｏｎｅＸｉａｏＰｅｉＧＵＡ?.. Base-Catalyzed Reforming of 11-Isopropylidene-anti-4,5-Epoxyendo-Tricyclo [6.2.1.0 ~ (2,7)] Undeca-4,9-Diene-3,6-D......