Commonwealth¹ Games women's 100m winner Damola Osayemi has been stripped of her gold medal after her B sample tested positive for a banned stimulant².

英联邦运动会女子100米冠军Damola Osayemi因B尿样检测结果呈阳性而被收回金牌。

The decision sees England's Katherine Endacott take the silver medal after finishing fourth last Thursday.

Australia's Sally Pearson had finished first but was controversially（引起争议地） disqualified for a false start.

Natasha Mayers of St Vincent and the Grenadines now wins Commonwealth gold, only the second ever for the country.

The bronze medal now goes to Delphine Atangana of Cameroon.

A statement from the Commonwealth Games Federation³ confirmed the result of the B sample.

It added that documents relating to the athlete had been referred to the International Association of Athletics⁴ Federations⁵ "for whatever subsequent action it might consider appropriate".

Osayemi's sample contained traces of banned stimulant methylhexaneamine, which has only recently been added to the World Anti-Doping Agency's prohibited list.

The 24-year-old requested the testing of her B sample after she was provisionally（临时地） suspended following the initial test. She could now face a two-year ban.

Methylhexaneamine is the same drug several Indian athletes, including weightlifter Sanamacha Chanu and swimmers Richa Mishra and Jyotsana Pansare, were found to have used in September.

Wada subsequently moved it to the non-specified list, meaning it can be used with a therapeutic⁶ use exception certificate.

The Indians subsequently appealed against their bans but there has been no verdict yet.

According to companies that market products that contain methylhexaneamine, the drug stimulates⁷ the central nervous system.

It gives the body an energy boost by increasing the body's metabolic⁸（新陈代谢） rate.

After the initial suspension, Nigeria's Athletics Federation president, Solomon Ogba, reportedly claimed Osayemi was given prescription⁹ medicine to fight a nagging¹⁰（唠叨的，挑剔的） toothache.

"She took medication for her toothache and we strongly suspect that it was that, which led to her failed drug test," he stated.

The BBC's Steve Cram¹¹ was not surprised to hear that this particular drug was involved.

"The stimulant she has been caught for has caused problems for athletes over the past year," he said.

"It's a commonly used stimulant as a nasal（鼻的） decongestant（解充血药） and, leading into the Games, there were 11 Indians from different sports who had tested positive for methylhexaneamine, so it's pretty prevalent（流行的，普遍的） ."