React Definir valores de atributo multibiloso

render () {
  return <div className='form-field'>
    <label className='form-label' htmlFor='user-email'>Email: </label>
    <input className='form-input form-input--email' id='user-email' type='email' name='user-email' placeholder={this.props.placeholder} required>
  </div>	
}
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