Correlations of a H3-10 signal (dH 1.71)
with carbon signals at dc 119.0 (C-2), 136.7 (C-3) and 33.6 (C-4) as
well as an H3-29 signal (dH 1.12) with carbon signals at dC 136.7 (C-
3), 33.6 (C-4) and 52.9 (C-5), indicated that two methyl groups are
attached to C-3 and C-4, respectively.