SB Šuʾilla Prayer to Nabu 6 (o1ˊ-8ˊ, r1-6). I learned about this fragment via the Electronic Babylonian Library's
Fragmentarium. As indicated
there, Enrique Jiménez made the initial identification of the fragment 1881-02-04, 0414; Tonio Mitto suggested joining it with K.21100.