"The synthetic compounds were so powerful that we stopped looking for natural pesticides."

Adverse health effects may be associated with some synthetic compounds in sunscreens.

Phenyl groups are found in many organic compounds, both natural and synthetic (see figure).

Some synthetic compounds of similar structure are also attributed to alkaloids.

Unlike most others, however, it is a completely synthetic compound.

One major distinction is between natural and synthetic compounds.

From inside a large mass of refined metals and synthetic compounds.

Butyrylcholine is a synthetic compound and does not occur in the body naturally.

Hundreds of synthetic organic compounds are known to be sweet.

It is a synthetic compound, which is not found naturally in plants.