precursor

"The amount of energy diverted to the biodiesel precursor, lipid, is even lower as lipid has high energy intensity," he said.

A task force in California has already seized 4.4 pounds of pink powder containing ketamine and despropionyl fentanyl, a fentanyl precursor, a recent study reported.

Chemical precursors are largely sourced from chemical companies in China that sell their products internationally.

The fall is also a precursor to darkness.

A claim against the city can be a precursor to a lawsuit.