1973 年 93 巻 8 号 p. 951-956
Among four stereoisomers (IXa, Xa, XIa, XIIa) of hydrofluorene derivatives recently derived from pine rosin, only IXa has a strong sweetness (ca. 1000 times sweeter than sucrose and ca. 12 times bitterer than caffeine) and others have no taste. Stability and acute toxicity of IXa were also examined.