Supplementary Data for the paper entitled: Stability and Reactivity of Cyclopentane Nucleoside Analogs in 98% w/w Sulfuric Acid Sara Seager 1,2,3,4,*, Maxwell D. Seager 4,5, Ton Visser 6, Nittert Marinus 6, Mael Poizat 6, Jim van Wiltenburg 6, Martin Poelert 6 and Janusz J. Petkowski 7,8 1 Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA 2 Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA 3 Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA 4 Nanoplanet Consulting, Concord, Massachusetts 01742, USA 5 Department of Chemistry and Biochemistry, Worcester Polytechnic Institute, Worcester, Massachusetts 01609, United States 6 Symeres Netherlands BV, Kadijk 3, 9747 AT Groningen, The Netherlands 7 Faculty of Environmental Engineering, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland 8 JJ Scientific, 02-792 Warsaw, Poland * Correspondence: seager@mit.edu