BENGALURU (Reuters) - Amazon.com Inc AMZN.O said on Wednesday it has sent a legal notice to a promoter of Future Group, alleging the Indian retailer breached the terms of its contract by signing a deal with Mukesh Ambani"s Reliance Industries RELI.NS. The online retail giant last year acquired a 49% stake in Future Coupons Ltd, the promoter entity which owns a 7.3% interest in Future Retail FTRL.NS, the operator of more than 1,500 stores in India including grocery chain Big Bazaar. Amazon’s investment in Future Group came with contractual rights that include a right of first refusal and a non-compete-like pact, a source told ET Now, which first reported the news. The e-commerce firm, in its legal notice, cited a contract arrangement that included “a restricted list” of companies Future was not supposed to enter deals with, ET Now said. An Amazon spokesperson confirmed the company had started the proceedings. Amazon, Reliance and Walmart Inc"s WMT.N Flipkart are in a battle to gain market share in India, where millions of middle class customers are newly adopting online purchases of food and groceries due to the COVID-19 pandemic. Reliance said in August it would acquire the retail and wholesale business as well as the logistics and warehousing business of Future in a deal valued at $3.38 billion. The oil-to-telecoms group, whose retail operation already runs close to 12,000 stores, is expanding its so-called new commerce venture, which ties neighborhood stores to Reliance for online deliveries of groceries, apparel and electronics in a space currently dominated by Flipkart and Amazon’s Indian arm. Future Group was not immediately available for comment. Reliance declined to comment.