Anticopalic acid

Imbricataloic acid has been obtained19 together with agathic acid 19-monomethyl ester from Pinus massoniana needles. The labdane acid, anticopalic acid, has been... 

Anticopalic acid [8(17)- -13-labdadien-15-oic acid] which possesses a normal a/b ring fusion and a trans relationship between the methyl group at C-13 and the hydrogen atom at C-14, has been isolated from the western white pine,... 

Anticopalic acid has been found in the needles and wood of Pinus strobus and in the wood of Pinus monticola. The diterpenoid constituents of Juniperus phoenica include manoyl oxide, eperuene diol, labd-8-ene-l2-hydroxy-19-oic acid (13), sandaracopimaric acid, and 6a-hydroxysandaracopimaric acid. Imbricatalic acid (14) has been isolatedas its methyl ester from Pinus elliottii. 

The cyclization of agathic acid by formic acid to afford the tricyclic isoagathic acid has been known for many years. The stereochemistry of the comparable cyclization products (15) and (16) of methyl jE-anticopalate (13) and methyl Z-anticopalate (14)... 

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