4β,10β-Dimethyl-7-oxo-1αH,5αH-decahydro-azulen-semicarbazon;Semicarbazon v. (-)-6.10-Dimethyl-bicyclo<5.3.0>decanon-(3);(3aS)-7-semicarbazono-1t.4t-dimethyl-(3arH.8acH)-decahydro-azulene;(3aS)-7-Semicarbazono-1t.4t-dimethyl-(3arH.8acH)-decahydro-azulen