Valmiki Ramayana Kishkindha Kanda Sarga 4 Shloka 15

दितेः Diti's, पुत्रः a son, शापात् by curse, राक्षसताम् as a demon, गतः became, दनुः नाम called Danu, तेन by him, वानरर्षभः the bull among monkeys, सुग्रीवः Sugriva, समर्थः capable, आख्यातः had said

'Diti's son called Danu who had been cursed to live the life of a demon had said that Sugriva, the best among monkeys, would be able to locate her.