a new class of natural products revealed by 3β-alkyi steranes in petroleum

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Page 1: A new class of natural products revealed by 3β-alkyI steranes in petroleum

© 1992 Nature Publishing Group

Page 2: A new class of natural products revealed by 3β-alkyI steranes in petroleum

© 1992 Nature Publishing Group

Page 3: A new class of natural products revealed by 3β-alkyI steranes in petroleum

© 1992 Nature Publishing Group

Page 4: A new class of natural products revealed by 3β-alkyI steranes in petroleum

© 1992 Nature Publishing Group