SEARCH Articles Figures Tables 3- Membered rings synthesis Heterocycles thioureas in synthesis Heterocyclic 5- membered ring In heterocyclic synthesis Of heterocyclic rings Of thiourea Of three-member rings Ring synthesis 9-membered rings Synthesis of Thioureas Synthesis of Three-Membered Rings Thioureas in synthesis of heterocycles Thioureas synthesis Three synthesis Three-membered Three-membered heterocycles Three-membered ring synthesis Three-membered rings With thiourea