THE expectation of stereoisomerism among semicarbazones is a natural corollary of the Hantzsch-Werner hypothesis, Up to the present time, however, it does not appear that any systematic attempt has been made to place the question of semicarbazoneisomerism on the
[Rao, Y. Koteswar; Nagarajan, M. Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1986 , vol. 25, p. 735 - 737]