1 HA5 (5r)-3-hydroxy-4,5,6,7-tetrahydroisoxazolo[5,4-C]pyridine-5-carboxylic acid 1.000 2 HA7 (7s)-3-hydroxy-4,5,6,7-tetrahydroisoxazolo[5,4-C]pyridine-7-carboxylic acid 0.857 3 EI7 4,5,6,7-tetrahydro-[1,2]oxazolo[5,4-C]pyridin-3-one 0.769