Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 51-60-5, Whether you call it Neostigmine Methylsulfate or 3-[N -N-Dimethylcarbamoyloxy]-N -N -N-trimethylanilinium Methyl Sulfate you can be assured the products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.