negotiable
Product Name: Sildenafil CAS NO.: 171599-83-0 Molecular Formula: C22H3N6O4S-C6H8O7 Molecular Weight: 666.7 Appearance: white to almost white crystalline powder, odorless, ....
Product Name: Calais Alias: Tadalafei CAS NO.: 171596-29-5 Molecular Fomula: C22H19N3O4 Molecular Weight: 389.41 Appearance: White powder, odorless, tasteless, can not soluble in....
Product Name: Vardenafil CAS NO.: 224789-15-5 Molecular Formula: C23H32N6O4S Appearance: White to almost white crystalline powder, odorless, a little acerbity, soluble in water, ....