Acting Iranian Foreign Minister and Head of the Atomic Energy Organization of Iran (AEOI) Ali Akabar Salehi on Saturday hailed the domestically-produced deuterated compounds at Arak heavy water plant and the achievement for its use in medical research.

Iran has become self-sufficient in deuterated compounds at Arak heavy water facility, the local satellite Press TV quoted an Iranian scientist as saying.

In a meeting with the delegates from Algeria, Cuba, Syria, Oman, Egypt, Venezuela, and the Arab League who arrived in Iran on Saturday for a tour to Iran's nuclear sites, Salehi described Iran's move as a gesture of "goodwill and transparency," Press TV said.

Iran's invitation to its nuclear sites is its last trust- building step, Salehi told local ISNA news agency.

"No country in the world will choose to show its nuclear facilities to others and Iran's invitation reiterates peaceful nature of its nuclear work, Salehi was quoted as saying by ISNA.

The Iranian official called on G5+1 to seize the opportunity in the next round of talks in Istanbul.