title: Two new sesquiterpene lactones from Ceiba pentandra.
abstract: Two new sesquiterpene lactones showing moderate antimicrobial activity have been isolated from the root bark of Ceiba pentandra (Bombacaceae) in addition to the known compounds 8-formyl-7-hydroxy-5-isopropyl-2-methoxy-3-methyl-1,4-naphthaquinone+  ++ [1], and 7-hydroxycadalene [2]. The new compounds were characterized as 2,7-dimethoxy-5-isopropyl-3-methyl-8,1-naphthalene carbolactone [3] and 2-hydroxy-5-isopropyl-7-methoxy-3-methyl-8,1-naphthalene carbolactone [4] by chemical and spectroscopic studies.
authors.affiliation: Department of Chemistry, Sri Venkateswara University, Tirupati, India.
authors.forename: K V
authors.initials: KV
authors.lastname: Rao
authors.forename: K
authors.initials: K
authors.lastname: Sreeramulu
authors.forename: D
authors.initials: D
authors.lastname: Gunasekar
authors.forename: D
authors.initials: D
authors.lastname: Ramesh
mesh_terms: D000890:Anti-Infective Agents / Q000302:isolation & purification* / Q000494:pharmacology; D007194:India; D007783:Lactones / Q000032:analysis / Q000302:isolation & purification* / Q000494:pharmacology; D008826:Microbial Sensitivity Tests; D010946:Plants, Medicinal / Q000737:chemistry*; D012717:Sesquiterpenes / Q000032:analysis / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D000890:Anti-Infective Agents; D007783:Lactones; D012717:Sesquiterpenes