Molecular size of Alexa 488 and Alexa 568

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Molecular size of Alexa 488 and Alexa 568

Hello all.
¿Someone knows molecular size of Alexa 488 or Alexa 647 or other characteristic on the size of these molecules?.
We know Molecular weight: 823.97 g/mol and Chemical formula: C33 H30 N2 O11 S2 . C8 H19 N of Alexa 568 and we want to know if there is  much difference in the size of these molecules

Thanks in advance

Maite

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