The optical rotation in solution of the compound is
specified in the following format:
'[\a]TEMPWAVE = SORT (c = CONC, SOLV)'
TEMP is the temperature of the measurement in degrees
WAVE is an indication of the wavelength of the light
used for the measurement,
CONC is the concentration of the solution given as the
mass of the substance in g in 100 ml of solution,
SORT is the signed value (preceded by a + or a - sign)
of 100.\a/(l.c), where \a is the signed optical
rotation in degrees measured in a cell of length l in
dm and c is the value of CONC as defined above, and
SOLV is the chemical formula of the solvent.