retail and wholesale services by direct solicitation by sales agents as well as catalog and electronic catalog ordering services featuring: chemicals for industrial use; chemicals for research use; chemicals for scientific use; chemical compounds; chemicals used to measure or trace when using nuclear magnetic resonance (NMR); chemicals used to measure or trace when using a mass spectrometer (MS); chemicals for qualitative analysis; chemicals used in pharmaceutical discoveries; chemicals used in academic research; chemicals for quantitative analysis; chemicals for environmental analysis; chemicals used in medical research; molecules; reagents; deuterated reagents; isotopes; isotopic labeled tracers and markers for research and industrial use; isotopes of carbon, hydrogen, nitrogen, and oxygen; isotopes for use in industry, medical diagnostics and research; stable-isotope labeled compounds; biochemical compounds; and highly enriched, stable (nonradioactive) labeled molecules; and custom mixtures of chemicals