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(CNN) -- Sakineh Mohammadie Ashtiani, a mother of two, is waiting to die in Iran by a method of execution described by her lawyer as "barbaric" -- stoning.

She will be buried up to her chest, deeper than a man would be, and the stones that will be hurled at her will be large enough to cause pain but not so large as to kill her immediately, according to an Amnesty International report that cited the Iranian penal code.

The 42-year-old woman from the northern city of Tabriz was convicted of adultery in 2006, and her execution is imminent, said prominent human rights lawyer Mohammad Mostafaei.

Ashtiani was forced to confess after being subjected to 99 lashes, Mostafaei said Thursday in a telephone interview from Tehran.

She later retracted that confession and has denied wrongdoing. Her conviction was based not on evidence but on the determination of three out of five judges, Mostafaei said. She has asked forgiveness from the court but the judges refused to grant clemency.

Iran's supreme court upheld the conviction in 2007.