C. F. Keil and Franz Delitzsch on 2 Chronicles 33:12-13

2Ch 33:12-13 לו וּכהצר = לו הצר וּבעת,   2Ch 28:22. In this his affliction he bowed himself before the Lord God of his fathers, and besought Him; and the Lord was entreated of him, and brought him again to Jerusalem, into his kingdom. The prayer which Manasseh prayed in his need was contained, according to 2Ch 33:18., in the histories of the kings of Israel, and in the sayings of the prophet Hozai, but has not come down to our day. The “prayer of Manasseh” given by the lxx is an apocryphal production, composed in Greek; cf. my Introduction to the Old Testament, § 247.