GC-MS analysis of hexane extracts from N. benthamiana transiently expressing C. forskohlii diTPSs. A, EIC of m/z 275. B, EIC of m/z 272. The letter “b” indicates (13R) manoyl oxide, “c” indicates (13S) manoyl oxide, “h” indicates dehydroabietadiene, “f” indicates miltiradiene, and “i” indicates trace amount of abietadiene.