O
HO
HO
OH
OH
O
OH
OH
OH
HO
O
image/svg+xmlOpenclipartLactose2013-08-28T20:15:33Public Domain Source http://commons.wikimedia.org/wiki/File:Lactose.svg https://openclipart.org/detail/182496/lactose-by-Magirly-182496Magirlychemistrylactoseupload2openclipart