1,3-Diphenylguanidine, >98%, 25g Back Catalog number: D0723 Availability: In the manufacturer's stock Price on request - + Recommended 91297 EPA Method 525.2 - 526 Internal Standard Price on request 70833 Siduron Price on request DF-IS-H Mass-Labelled PCDF Internal Standard Solution, 1.2ml, nonane Price on request