SAO PAULO, May 6 (Reuters) - Brazilian petrochemical

producer Braskem ( BAK ) said on Monday that Abu Dhabi oil

company ADNOC has decided to terminate talks to buy a

stake held by conglomerate Novonor in the firm, according to a

securities filing.

ADNOC had presented in November a non-binding offer for the

stake that implied the price of 37.29 reais per share, totaling

an equity value of 10.5 billion reais ($2.1 billion).

Novonor, formerly known as Odebrecht, holds a 38.3%

controlling stake in the petrochemical firm, which also has

state-run oil giant Petrobras as a major shareholder.

($1 = 5.0830 reais)