2r 3s 4s 5r )- 2 3 4 5 6 pentahydroxyhexanal July 8, 2019 16 32 64 128 (2r 3s 4r 5r)-2 3 4 5 6-pentahydroxyhexanal (2r 3s 4r 5s)-2 3 4 5 6-pentahydroxyhexanal (2s 3s 4r 5r)-2 3 4 5 6-pentahydroxyhexanal (2s 3r 4r 5r)-2 3 4 5 6-pentahydroxyhexanal