CH_{3} H CH_{3} | | | C_{2}H_{5}-C=C C_{2}H_{5}-C=C C_{2}H_{5}-C=C | \ | \ | \ | NH | NH | NH | / | / | / CH_{3}-C=C CH_{3}-C=C CH_{3}-C=C | | | CH_{3} CH_{3} H Phyllopyrrole Hæmopyrrole Isohæmopyrrole As a result of the study of these decomposition units, Willstätter has suggested the following formulas for the structural arrangement of ætiophyllin and ætioporphyrin, the compounds which result from the removal of all of the acid groups and finally of the magnesium from the chlorophylls, H HC===CH | | | CH_{3}-C--C C---C ║ \\ // ║ ║ N N ║ ║ / · · \ ║ C_{2}H_{5}-C--C · · C---CH \ · · // C------------C / · · \ C_{2}H_{5}-C==C · · C==C-C_{2}H_{5} | \ ·· / | | N-----Mg-----N | | / \ | CH_{3}-C==C C==C-C_{2}H_{5} | | CH_{3} CH_{3} Ætiophyllin H HC===CH | | | CH_{3}-C--C C---C ║ \\ // ║ ║ N N ║ ║ / \ ║ C_{2}H_{5}-C--C C---CH \ // C------------C / \ C_{2}H_{5}-C==C C==C-C_{2}H_{5} | \ / | | N N | | / \ | CH_{3}-C==C C==C-CH_{3} | | CH_{3} CH_{3} Ætioporphyrin