CORRECTED-UPDATE 1-Monsanto unfazed by legal wrangles, keeps Brazil dicamba-tolerant seed launch

SAO PAULO, March 16 (Reuters) - U.S. agricultural biotech firm Monsanto Co plans to push ahead with its launch schedule for soy seeds genetically modified to resist dicamba weed killer in Brazil, despite a pending patent dispute related to an older version of the technology, two executives told Reuters.