The subject product is called IPTG. It is known by the chemical name of 1-Isopropylthio-b-D-Galactopyranoside (CAS # 367-93-1). IPTG will be used as a reagent in molecular biology research. It is used to induce protein expression where the gene is under the control of the lac operator. IPTG is presented in a white powder form. It will be imported in 5-50 gram quantities for retail sale to customers. It is for pharmaceutical and biomedical research use, but you state that it is not for clinical diagnostic procedures.
[1] Please importantly note that only the relevant portion of the related is displayed above. You may refer to the said customs ruling for the entire ruling explanation.
[1]. https://rulings.cbp.gov/ruling/N313621