Attention pls As this goods alsocan be used to make drug,so in order to confirm it will be used legally, we only sell it to end user. If you are end user and you are interesting in PMK ,pls contact with us. Thank you Piperonyl Methyl Ketone Molecular weight:C10H10O3 Mol.Wt.:178.19 Quality standard: appearance : pale yellow liquid refractive indexAT20:1.532-1.539 specific gravity AT25:1.194-1.201 assay: 98%