calling parent using less

.span {
   background-color: #E28F8F;
}
.active {
    .span {
      &.span2 {
         background-color: #fff;
      } 
    }
}

.span {
   background-color: #E28F8F;
   .active &.span2 {
       animation: cr 2s linear;
   } 
}