Indiana Code Title 35. Criminal Law and Procedure § 35-48-1.1-25

Sec. 25. “Immediate precursor” means a substance which the board has found to be and by rule designates as being the principal compound commonly used or produced primarily for use, and which is an immediate chemical intermediate used or likely to be used in the manufacture of a controlled substance, the control of which is necessary to prevent, curtail, or limit manufacture.