<jats:p> A chemical examination of Corydalis caseana has yielded a total of ten alkaloids. Of these, protopine, α-allocryptopine, bicuculline, corypalmine, and scoulerine are known alkaloids. The remaining five appear to be new and include: caseanine, C<jats:sub>21</jats:sub>H<jats:sub>25</jats:sub>O<jats:sub>4</jats:sub>N; casealutine and alkaloid F34, isomeric and represented by C<jats:sub>20</jats:sub>H<jats:sub>23</jats:sub>O<jats:sub>4</jats:sub>N; alkaloid F33, C<jats:sub>19</jats:sub>H<jats:sub>21</jats:sub>O<jats:sub>4</jats:sub>N; and alkaloid F35, C<jats:sub>20</jats:sub>H<jats:sub>23</jats:sub>O<jats:sub>4</jats:sub>N. The new alkaloids are phenolic except caseanine which is the monomethyl ether of casealutine and the dimethyl ether of aurotensine.