Separation of gibberellin A4 from A4 and A7 mixture by selective complex

Gibberellin A4 is effectively separated from mixture of gibberellin A4 and its analugue gibberellin A7, in the form of its crystalline complex with N,N,N',N'-tetramethylethylenediamine. After removing the tetramethylethylenediamine from the crystal by dilute HCl, gibberellin A4 is obtained a purity of 98.1% and a yield of 72.7%.