CD Ae 240 nm 102 81a

FIGURE 4.11 Conformation of p-bromobenzoates 81a and 81b based on NOEs, indicated by arrows, and the results of their CD spectra

OH

SCHEME 4.6 Chemical correlation of 72 and 75 with 68

FIGURE 4.12 Relative stereochemistry of 77a based on NOEs, indicated by arrows

oh oh

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