High quality, fast turn aroundcustomer synthesis of various PEG derivatives. All productsare made in our PEGLAB in Boston, USA. Vinyl sulfone, other silane, phospholipid and IR fluorescent PEGderivatives available, call for details! 1-888-908-8803! Methoxyl PEGRhodamine B, MW 2000, 5000, 10000, 20000, 30000, 40000. Exictation/Emissionwavelength 575 /595 nm. Other Rhodamine PEG derivatives, RB-PEG-X, X=-NHS,Maleimide, -NH2,-OH, -COOH, -SH, Biotin, etc. Other fluorescent PEGs, including near IR fluorescent PEG derivatives, Cy3, Cy5, Cy7 or Alexafluoro dye labeled PEG now available, call for details. 1-888-998-8803. P.O. Box 130024,Boston, MA 02113, USA. Tel: 1-888-908-8803; 1-917-400-4863; Fax: 1-917-591-2212; Email:sales@nanocs.com. We accept credit cards.