Predict the number of distinct quartets expected in the off-resonance decoupled 13C NMR spectrum of the compound shown below. 
Definitions:
Dosage Compensation
Genetic mechanism by which the expression of X-linked genes is made equivalent in XX females and XY males; in mammals this is accomplished by rendering all but one X chromosome inactive.
X Chromosome Inactivation
A process by which one of the copies of the X chromosome present in female mammals is inactivated, ensuring that males and females have the same dose of the X chromosome genes.
X Chromosome Inactivation Center (XIC)
A critical region on the X chromosome that controls the process of X chromosome inactivation during female development.
Codominance
A genetic scenario where two alleles of a gene pair in a heterozygote are fully expressed, resulting in offspring with a phenotype that is neither dominant nor recessive.
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