Solanum steroid alkaloids spirosolane

The structural features of the solanum alkaloids are based on two primary skeletal configurations solanidane, with or without glycoside functionalities, as featured by the toxic and teratogenic steroidal alkaloids a-chaconine and a-solanine with the indolizidine type E-F ring (Figure 2.7a) and the spirosolane... 

Hydroxy-spirosolanes (Fig. 7.19). Solasodine is the dominating congener of the 25/ -series (22ot/V-configurated) and even the most frequent individual aglycone of all types of solanaceous glycoalkaloids. It was detected unequivocally in 207 out of 367 steroidal alkaloid-positive Solanum spp. (56%). 

---