保幼素的化学本质是什么？

保幼激素的形式（化学式） Forms Methyl farnesoate CAS methyl (2E,6E)-3,7,11-trimethyl-2,6-dodecadienoate Formula: C 16 H 26 O 2 Juvenile hormone 0 (found in Lepidoptera) CAS methyl (2E,6E)-10R,11S-(oxiranyl)-3,7-diethyl-11-methyl-2,6-tridecadienoate Formula: C 19 H 32 O 3 Juvenile hormone I (found in Lepidoptera) CAS methyl (2E,6E)-10R,11S-(oxiranyl)-7-ethyl-3,11-dimethyl-2,6-tridecadienoate Formula: C 18 H 30 O 3 Juvenile hormone II (found in Lepidoptera) CAS methyl (2E,6E)-10R,11S-(oxiranyl)-3,7,11-trimethyl-2,6-tridecadienoate C 17 H 28 O 3 Juvenile hormone III CAS methyl (2E,6E)-10R-(oxiranyl)-3,7,11-trimethyl-2,6-dodecadienoate Formula: C 16 H 26 O 3 Juvenile hormone JHB3 (found in diptera) CAS methyl (2E,6E)-6S,7S,10R-(dioxiranyl)-3,7,11-trimethyl-2,6-dodecadienoate Formula: C 16 H 26 O 4 可以参照下列文献： Wigglesworth, VB. (1964) The hormonal regulation of growth and reproduction in insects. Adv. Insect Physiol. 2: 247-336 Wigglesworth, VB. (1939) The Principles of Insect Physiology. Cambridge University Press. Cambridge. Berger and Dubrovsky (2005) Juvenile Hormone Molecular Actions and Interactions During Development of Drosophila. Vitamins and Hormones. 73:172-215