SEARCH Articles Figures Tables By Cleavage of Pteridines and Other Ring Systems Formation of Other Ring Systems From Other Ring Systems Hydrogenation of Other Ring Systems Other Condensed Ring Systems incorporating Isothiazole Other Phosphorus-Containing Diketo-Ring Systems Other Six-Membered Ring Systems Substitution, electrophilic other ring systems Surface films of sterols and other substances with complex ring systems Syntheses of Thiophens from other Ring Systems