Odd lettering in IUPAC name
I am sorry if this is too much of a beginner question but, earlier today I was looking at gibberellic acid on wikipedia and noticed how the IUPAC name
had a bunch of weird letters at the beginning. In fact, here it is:
(3S,3aS,4S,4aS,7S,9aR,9bR,12S)-7,12-dihydroxy-3-methyl-6-methylene-2-oxoperhydro-4a,7-methano-9b,3-propenoazuleno[1,2-b]furan-4-carboxylic acid
What I am confused by is the 3S,3aS,4S etc. stuff. What does it mean? I've seen it before on other molecules which were also from biological origins,
if that makes any difference.
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