chemicals : Formamide, N-methyl Formamide, N, n, n', n'-tetramethylethylenediamine, 2, 2'-dichlorodiethyl Ether, Trimethylchlorosilane, N-methyl Morpholine, N-formylmorpholine, N-methylpiperidine, 2-methylpiperidine,
3-methylpiperidine, 4-methylpiperidine.