What is Hetail du tableau No.23263 Musee National du Louvre, Sainte Anne, by da Vinci?

Hetail du tableau translates as picture detail. The Louvre has obviously numbered a detail of one of daVinci's works, possibly The Virgin and Child with St Anne and St John the Baptist, sometimes called The Burlington House Cartoon or The Madonna of the Rocks, which is a painting of the same subjects.