Contents: A.B. Ray and M. Gupta: Withasteroids, a Growing Group of Naturally Occurring Steroidal Lactones. L. Rodriguez-Hahn, B. Esquivel, and J. Cardenas: Clerodane Diterpenes in Labiatae. Author Index. Subject Index. The volumes of this classic series, now referred to simply as "Zechmeister" after its founder, L. Zechmeister, have appeared under the Springer Imprint ever since the series' inauguration in 1938. The volumes contain contributions on various topics related to the origin, distribution, chemistry, synthesis, biochemistry, function or use of various classes of naturally occurring...