Exhibit No. 2.6 FIRST SUPPLEMENTAL INDENTURE FIRST SUPPLEMENTAL INDENTURE (the "First Supplemental Indenture"), effective as of March 31, 2003, by and among Petrobras International Finance Company, an exempted company incorporated with limited...Supplemental Indenture • June 19th, 2003 • Brazilian Petroleum Corp • Crude petroleum & natural gas • New York
