Care A2 Plus, the local infant formula producer targeting a $500 million ASX float, has asked the Federal Court to reverse a decision that has led its distribution partner in the United States to sue its founder, chief executive and chairman in a Miami court.

The move is an escalation of a dispute between the company and Gensco Pharma, which has alleged it lost more than $200 million in future profits because Care A2 misled it when it claimed to be able to produce almost five million tins of formula per month to supply to the US, which was suffering a major shortage in supply last year.