[CH3;!r3;!r4;!$ALPHA1;!$QALLYL;$CALLYL;*:1]\ >>\ [CH2;!r3;!r4;!$ALPHA2;!$QALLYL;$CALLYL;*:1][BrH0;!r3;!r4;!$ALPHA1;!$CALLYL;!$QALLYL;*]