The AIU charged Kipsang for whereabouts failures and tampering samples.
Under WADA anti-doping rules, athletes have to inform testing agents of their whereabouts for a one hour window of every day.
Three whereabouts failures in one year - not being present at the said time, or ssubmitting inaccurate information, counts as one failure - leads to an automatic ban from sports.
In 2013 Kipsang set a marathon World record of 2:03:23 at the BMW Berlin Marathon. In 2016 he set the 6th fastest marathon time in the history of 2:03:13. He is the only man to beat the curent World marathon record holder, Eliud Kipchoge, in the marathon.
See the full list of athletes suspended for doping by AIU here.