2-METHYL-AP-237 HCl2-METHYL-AP-237 pelletssynthetic opioid research chemicalAP-237 analoglab use only compoundforensic analysis chemicalanalytical reference standard2-METHYL-AP-237 HCl2-METHYL-AP-237 powderAP-237 HCl analogresearch chemical suppliersynthetic opioid for lab useanalytical standard compoundpharmacological test substance2-FA Pellets 60