Abstract
The ethyl acetate soluble part of methanolic extract of marine green alga Codium iyengarii collected from Karachi coast of Arabian Sea afforded a new steroid ( 1 , iyengadione) and two new steroidal glycosides [iyengaroside-A ( 2 ) and B ( 3 )] along with clerosterol galactoside ( 4 ). Their structures were elucidated with the aid of 1D-NMR spectroscopy and reconfirmed through HMBC experiments. The bactericidal activity of 1 - 4 was also explored and found positive response from iyengaroside-A ( 2 ) and clerosterol galactoside ( 4 ).