OFFER TO PURCHASE FOR CASH ITS OUTSTANDING US$400,000,000 7.00% SENIOR NOTES DUE 2021 IN A CASH AMOUNT SUBJECT TO THE NET PROCEEDS FROM THE NEW NOTES ISSUANCE

OFFER TO PURCHASE FOR CASH ITS OUTSTANDING US$400,000,000 7.00% SENIOR NOTES DUE 2021 IN A CASH AMOUNT SUBJECT TO THE NET PROCEEDS FROM THE NEW NOTES ISSUANCE