结论：该结晶鉴定为异海松酸；
Conclusion:Its structure was identified as isopimaric acid .
以富马酸和松香为原料制备富马海松酸。
Fumaropimaric acid was prepared from rosin and fumaric acid as raw materials.
该方法开辟了在较缓和条件下，从脂松香制备高得率马来海松酸的途径。
The method supplies an approach of high yield to synthesize maleopimaric acid from gum rosin of pinus massonina under more mild condition.
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