LONDON/JOHANNESBURG/MELBOURNE (Reuters) -Anglo American on Wednesday rejected BHP Group's last-ditch request for more time to discuss a $49 billion takeover offer, dismissing it as highly complex and likely ending a five-week pursuit by the bigger rival. Anglo had granted BHP a one week extension until 1600 GMT on Wednesday to its original May 22 deadline to submit a binding offer, after rejecting a third takeover proposal that it dismissed as difficult to execute. It did not immediately respond to a request for comment, but has previously indicated it would not make a hostile bid.