Simply, it means, all kind of plants produce certain chemical compounds, which have a biological activity may it be not yet observed or already had been observed their chemical structure. After extracting one of them from the plant, researchers may change their structure by chemical modification and obtain new compound which may have different biological activity than the initial one. In that case, the new compound is called semi-synthesized compound, which based obtained on the modification of natural compound. The compound may be an object for the protection of intellectual property if it is not yet known for scientific society. The modification is used for reducing side effects (including toxicity) of the known biologically active compound or increasing its specific activity. In both cases, usually, the index of effectiveness of the biological active compound is increased.

Simply, it means, all kind of plants produce certain chemical compounds, which have a biological activity may it be not yet observed or already had been observed their chemical structure. After extracting one of them from the plant, researchers may change their structure by chemical modification and obtain new compound which may have different biological activity than the initial one. In that case, the new compound is called semi-synthesized compound, which based obtained on the modification of natural compound. The compound may be an object for the protection of intellectual property if it is not yet known for scientific society. The modification is used for reducing side effects (including toxicity) of the known biologically active compound or increasing its specific activity. In both cases, usually, the index of effectiveness of the biological active compound is increased.

Dear Ali, Yes certainly, I agree with Dr. Nodirali S .

There are secondary metabolites & other compounds synthesized by plants, which humans can copy for synthesis.

Yes I do agree noderalie.