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methyl 2-carboxy-3,12-dioxooleana-1,9(11)-dien-28-oate (29).
3-oxooleana-1,12-dien-28-oic acid.
Methyl 3,12-Dioxooleana-1,9(11)-dien-28-oate (9).
3,12-Dioxooleana-1,9(11)-dien-28-oic Acid (10).
Methyl 3,11-Dioxoursa-1,12-dien-28-oate (13).
3-Oxooleana-1,9(11)-dien-28-oic Acid (18).
3,11-Dioxooleana-1,12-dien-28-yl Acetate (22).
9,11-Epoxy-3-oxoolean-1-en-28-oic Acid (21).
3-Oxooleana-1,11,13(18)-trien-28-oic Acid (20).
28-Hydroxyoleana-1,12-diene-3,11-dione (23).
Methyl 2-Cyano-3,12-dioxooleana-1,9(11)-dien-28-oate.
Methyl 2-Methoxycarbonyl-3,12-dioxooleana-1,9(11)-dien-28-oate (27).
2-Carboxy-3,12-dioxooleana-1,9(11)-dien-28-oic Acid(30).
Methyl 2-Aminocarbonyl-3,12-dioxooleana-1,9(11)-dien-28-oate (36).
Methyl 2-Formyl-3,12-dioxooleana-1,9(11)-dien-28-oate(37).
Methyl 3¦Â-Hydroxy-12-oxooleanan-28-oate (50).
Methyl 11-Oxoisoxazolo[4,5-b]olean-12-en-28-oate (66).
Methyl 11-Oxoisoxazolo[4,5-b]urs-12-en-28-oate (69).

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We have designed and synthesized 16 new olean- and urs-1-en-3-one triterpenoids with various modified rings C as potential antiinflammatory and cancer chemopreventive agents and evaluated their inhibitory activities against production of nitric oxide induced by interferon-¦Ã in mouse macrophages.
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