SEARCH Articles Figures Tables Annelation Annelation of a pyrimidine ring Annelation of a pyrimidine ring to an existing Annelation-ring cleavage Annelation-ring cleavage 3 + 2]Annelations Cyclization Robinson ring annelation Eight-Membered Ring Preserved Annelations Furan ring annelation Pyridine ring annellation Pyrimidine ring annelation to an existing Pyrimidine ring annellation Ring closure (s. a. Annelation Robinson ring annelation Spiro-ring Annelations