I don't mean to make mistakes; it's just absent-mindedness.

The L-arabinose derivatives 14 and 18 substituted at position 2 with a phosphate or an isopropylphosphate, respectively, were prepared from the same starting phosphinylated L-arabinose 3 following a similar sequence.

Saffrond wyne bryngeth mirthe, and taketh away Melancholines […]

She had a smidgy bit of dirt on her shoes.