Petuniasterones, novel ergostane-type steroids of Petunia hybridia Vilm. (Solanaceae) having insect-inhibitory activity. X-Ray molecular structure of the 22,24,25-[(methoxycarbonyl)orthoacetate] of 7?,22,24,25-tetrahydroxy ergosta-1,4-dien-3-one and of 1?-acetoxy-24,25-epoxy-7?-hydroxy-22-(methylthiocarbonyl)acetoxyergost-4-en-3-one

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