Assign the chiral center as R or S. 
Definitions:
Gastrulation
A phase early in embryonic development during which the single-layered blastula reorganizes into a multilayered structure, forming the embryonic germ layers.
Blastulation
An early stage in embryonic development that results in the formation of a blastula, a sphere of cells surrounding a fluid-filled cavity.
Gray Crescent
An area that appears on the surface of amphibian eggs following fertilization, indicating where the dorsal side of the embryo will develop.
Cleavage
The series of cell divisions of a fertilized egg that leads to the formation of the embryo.
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