D, l, dl

{
  "id": "MLC-T-CHM-002849",
  "term": "D, l, dl",
  "field": "Chemistry",
  "definition": "Obsolete lowercase prefixes for the sign of optical rotation, d for dextrorotatory, l for levorotatory, and dl for a racemate, now written (+), (-), and (±). They are not the same as the small-capital D and L descriptors, which relate configuration to glyceraldehyde and remain in use for sugars and amino acids. Rotation sign and configuration are independent: D-glucose is dextrorotatory, but D-fructose is levorotatory.",
  "synonyms": [
    "plus",
    "minus",
    "+,-"
  ],
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "enantiomer",
    "racemate"
  ],
  "references": [
    "PAC, 1996, 68, 2193. 'Basic terminology of stereochemistry (IUPAC Recommendations 1996)' on page 2205 (https://doi.org/10.1351/pac199668122193)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/d-l-dl/"
}