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(a) FTIR spectrum of P4 showing the characteristic peaks of the steroidal lactone backbone and (b) NMR spectrum of P4 showing the peaks characteristic of the steroidal lactone backbone. The inset shows the peaks from 5.4 to 6.5 chemical shifts and the steroidal lactone structure. Structural formula in (a) is the reprinted from (26). Structural formula in (b) is reprinted with permission from ref (27). Copyright 2003 Elsevier.
