Note that the 180° 13 C pulse on the y' axis inverts Sx. The 1H pulse rotates I1 from +X toward —z by the angle © and rotates I2 from +z toward +X by the angle ©. Any term with either H1 or H2 in the x'-y' plane will represent MQC, as 13C is already in the x'-y' plane, so we can ignore these terms because they are not observable in the FID. The only term of interest is the doubly antiphase term:

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