13C-NMR assignments of some insect molting hormones

13C-NMR assignments of some insect molting hormones including ecdysone, 20-hydroxyecdysterone, ponasterone A and inokosterone, were made by using ecdysone as the model compound, whose carbon chemical shifts were assigned via NMR techniques including nOe and COSY, hetero-COSY and hetero-long range-COSY.